Solve 3200+20x+2x^2

$$3200+20x+2 { x }^{ 2 }$$

Factor

$$2\left(x^{2}+10x+1600\right)$$

Solution Steps

Factor out 2. Polynomial 1600+10x+x^{2} is not factored since it does not have any rational roots.

$$2\left(1600+10x+x^{2}\right)$$

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.

$$2x^{2}+20x+3200=0$$

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.

$$x=\frac{-20±\sqrt{20^{2}-4\times 2\times 3200}}{2\times 2}$$

Square 20.

$$x=\frac{-20±\sqrt{400-4\times 2\times 3200}}{2\times 2}$$

Multiply -4 times 2.

$$x=\frac{-20±\sqrt{400-8\times 3200}}{2\times 2}$$

Multiply -8 times 3200.

$$x=\frac{-20±\sqrt{400-25600}}{2\times 2}$$

Add 400 to -25600.

$$x=\frac{-20±\sqrt{-25200}}{2\times 2}$$

Since the square root of a negative number is not defined in the real field, there are no solutions. Quadratic polynomial cannot be factored.

$$2x^{2}+20x+3200$$

Evaluate

$$2\left(x^{2}+10x+1600\right)$$