Simplify -4x(-5+4x)-2x?

May 18, 2016

$- 4 x \left(- 5 + 4 x\right) - 2 x = 20 x - 8 {x}^{2}$ko

Explanation:

$- 4 x \left(- 5 + 4 x\right) - 2 x$

= $\left(- 4 x\right) \left(- 5\right) + \left(- 4 x\right) \left(4 x\right) - 2 x$

= $20 x + \left(- 16 {x}^{2}\right) - 2 x$

= $20 x - 16 {x}^{2} - 2 x$

= $18 x - 16 {x}^{2}$

May 18, 2016

$- 4 x \left(- 5 + 4 x\right) - 2 x = \textcolor{b l u e}{- 16 {x}^{2} - 18 x}$

Explanation:

$- 4 x \left(- 5 + 4 x\right) - 2 x$

The expression inside the parentheses cannot be simplified further and there are no exponents.

Multiply $- 4 x$ times the expression inside the parentheses.

$- 4 x \left(- 5 + 4 x\right) - 2 x =$

$20 x - 16 {x}^{2} - 2 x$

Rewrite the expression in standard form.

$- 16 {x}^{2} + 20 x - 2 x$

Simplify.

$- 16 {x}^{2} + 18 x$