Solve 8x^2+8x

$$8 x ^ { 2 } + 8 x$$

Factor

$$8x\left(x+1\right)$$

Solution Steps

Factor out 8.

$$8\left(x^{2}+x\right)$$

Consider x^{2}+x. Factor out x.

$$x\left(x+1\right)$$

Rewrite the complete factored expression.

$$8x\left(x+1\right)$$

Steps Using the Quadratic Formula

Quadratic polynomial can be factored using the transformation ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right), where x_{1} and x_{2} are the solutions of the quadratic equation ax^{2}+bx+c=0.

$$8x^{2}+8x=0$$

All equations of the form ax^{2}+bx+c=0 can be solved using the quadratic formula: \frac{-b±\sqrt{b^{2}-4ac}}{2a}. The quadratic formula gives two solutions, one when ± is addition and one when it is subtraction.

$$x=\frac{-8±\sqrt{8^{2}}}{2\times 8}$$

Take the square root of 8^{2}.

$$x=\frac{-8±8}{2\times 8}$$

Multiply 2 times 8.

$$x=\frac{-8±8}{16}$$

Now solve the equation x=\frac{-8±8}{16} when ± is plus. Add -8 to 8.

$$x=\frac{0}{16}$$

Divide 0 by 16.

$$x=0$$

Now solve the equation x=\frac{-8±8}{16} when ± is minus. Subtract 8 from -8.

$$x=-\frac{16}{16}$$

Divide -16 by 16.

$$x=-1$$

Factor the original expression using ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right). Substitute 0 for x_{1} and -1 for x_{2}.

$$8x^{2}+8x=8x\left(x-\left(-1\right)\right)$$

Simplify all the expressions of the form p-\left(-q\right) to p+q.

$$8x^{2}+8x=8x\left(x+1\right)$$

Evaluate

$$8x\left(x+1\right)$$