Solve (x+1)^2(x-(1-3i))(x-(1+3i))

$$( x + 1 ) ^ { 2 } ( x - ( 1 - 3 i ) ) ( x - ( 1 + 3 i ) )$$

Evaluate

$$\left(x+\left(-1-3i\right)\right)\left(x+\left(-1+3i\right)\right)\left(x+1\right)^{2}$$

Solution Steps

Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+1\right)^{2}.

$$\left(x^{2}+2x+1\right)\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Use the distributive property to multiply x^{2}+2x+1 by x-\left(1-3i\right).

$$\left(x^{2}\left(x-\left(1-3i\right)\right)+2x\left(x-\left(1-3i\right)\right)+x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Use the distributive property to multiply x^{2}\left(x-\left(1-3i\right)\right)+2x\left(x-\left(1-3i\right)\right)+x-\left(1-3i\right) by x-\left(1+3i\right).

$$x^{2}\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)+2x\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Multiply -1 and 1-3i to get -1+3i.

$$x^{2}\left(x+\left(-1+3i\right)\right)\left(x-\left(1+3i\right)\right)+2x\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Multiply -1 and 1+3i to get -1-3i.

$$x^{2}\left(x+\left(-1+3i\right)\right)\left(x+\left(-1-3i\right)\right)+2x\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Use the distributive property to multiply x^{2} by x+\left(-1+3i\right).

$$\left(x^{3}+\left(-1+3i\right)x^{2}\right)\left(x+\left(-1-3i\right)\right)+2x\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Use the distributive property to multiply x^{3}+\left(-1+3i\right)x^{2} by x+\left(-1-3i\right) and combine like terms.

$$x^{4}-2x^{3}+10x^{2}+2x\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Multiply -1 and 1-3i to get -1+3i.

$$x^{4}-2x^{3}+10x^{2}+2x\left(x+\left(-1+3i\right)\right)\left(x-\left(1+3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Multiply -1 and 1+3i to get -1-3i.

$$x^{4}-2x^{3}+10x^{2}+2x\left(x+\left(-1+3i\right)\right)\left(x+\left(-1-3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Use the distributive property to multiply 2x by x+\left(-1+3i\right).

$$x^{4}-2x^{3}+10x^{2}+\left(2x^{2}+\left(-2+6i\right)x\right)\left(x+\left(-1-3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Use the distributive property to multiply 2x^{2}+\left(-2+6i\right)x by x+\left(-1-3i\right) and combine like terms.

$$x^{4}-2x^{3}+10x^{2}+2x^{3}-4x^{2}+20x+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Combine -2x^{3} and 2x^{3} to get 0.

$$x^{4}+10x^{2}-4x^{2}+20x+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Combine 10x^{2} and -4x^{2} to get 6x^{2}.

$$x^{4}+6x^{2}+20x+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Multiply -1 and 1-3i to get -1+3i.

$$x^{4}+6x^{2}+20x+\left(x+\left(-1+3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Multiply -1 and 1+3i to get -1-3i.

$$x^{4}+6x^{2}+20x+\left(x+\left(-1+3i\right)\right)\left(x+\left(-1-3i\right)\right)$$

Use the distributive property to multiply x+\left(-1+3i\right) by x+\left(-1-3i\right) and combine like terms.

$$x^{4}+6x^{2}+20x+x^{2}-2x+10$$

Combine 6x^{2} and x^{2} to get 7x^{2}.

$$x^{4}+7x^{2}+20x-2x+10$$

Combine 20x and -2x to get 18x.

$$x^{4}+7x^{2}+18x+10$$

Expand

$$x^{4}+7x^{2}+18x+10$$

Solution Steps

Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+1\right)^{2}.

$$\left(x^{2}+2x+1\right)\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Use the distributive property to multiply x^{2}+2x+1 by x-\left(1-3i\right).

$$\left(x^{2}\left(x-\left(1-3i\right)\right)+2x\left(x-\left(1-3i\right)\right)+x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Use the distributive property to multiply x^{2}\left(x-\left(1-3i\right)\right)+2x\left(x-\left(1-3i\right)\right)+x-\left(1-3i\right) by x-\left(1+3i\right).

$$x^{2}\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)+2x\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Multiply -1 and 1-3i to get -1+3i.

$$x^{2}\left(x+\left(-1+3i\right)\right)\left(x-\left(1+3i\right)\right)+2x\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Multiply -1 and 1+3i to get -1-3i.

$$x^{2}\left(x+\left(-1+3i\right)\right)\left(x+\left(-1-3i\right)\right)+2x\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Use the distributive property to multiply x^{2} by x+\left(-1+3i\right).

$$\left(x^{3}+\left(-1+3i\right)x^{2}\right)\left(x+\left(-1-3i\right)\right)+2x\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Use the distributive property to multiply x^{3}+\left(-1+3i\right)x^{2} by x+\left(-1-3i\right) and combine like terms.

$$x^{4}-2x^{3}+10x^{2}+2x\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Multiply -1 and 1-3i to get -1+3i.

$$x^{4}-2x^{3}+10x^{2}+2x\left(x+\left(-1+3i\right)\right)\left(x-\left(1+3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Multiply -1 and 1+3i to get -1-3i.

$$x^{4}-2x^{3}+10x^{2}+2x\left(x+\left(-1+3i\right)\right)\left(x+\left(-1-3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Use the distributive property to multiply 2x by x+\left(-1+3i\right).

$$x^{4}-2x^{3}+10x^{2}+\left(2x^{2}+\left(-2+6i\right)x\right)\left(x+\left(-1-3i\right)\right)+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Use the distributive property to multiply 2x^{2}+\left(-2+6i\right)x by x+\left(-1-3i\right) and combine like terms.

$$x^{4}-2x^{3}+10x^{2}+2x^{3}-4x^{2}+20x+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Combine -2x^{3} and 2x^{3} to get 0.

$$x^{4}+10x^{2}-4x^{2}+20x+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Combine 10x^{2} and -4x^{2} to get 6x^{2}.

$$x^{4}+6x^{2}+20x+\left(x-\left(1-3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Multiply -1 and 1-3i to get -1+3i.

$$x^{4}+6x^{2}+20x+\left(x+\left(-1+3i\right)\right)\left(x-\left(1+3i\right)\right)$$

Multiply -1 and 1+3i to get -1-3i.

$$x^{4}+6x^{2}+20x+\left(x+\left(-1+3i\right)\right)\left(x+\left(-1-3i\right)\right)$$

Use the distributive property to multiply x+\left(-1+3i\right) by x+\left(-1-3i\right) and combine like terms.

$$x^{4}+6x^{2}+20x+x^{2}-2x+10$$

Combine 6x^{2} and x^{2} to get 7x^{2}.

$$x^{4}+7x^{2}+20x-2x+10$$

Combine 20x and -2x to get 18x.

$$x^{4}+7x^{2}+18x+10$$