How do you multiply $-x (4x^2 - 2x) - 5x^3$ ?

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Answer 1 · 2018-03-20T03:20:15

$-x (4x^2 - 2x) - 5x^3 = color(brown)(-9x^3 + 2x^2$

$-x (4x^2 - 2x) - 5x^3$

$=> -x * 4 x^2 - x * -2x - 5x^3$ Removing the bracket.

$=> - 4 (x^2 * x) + (2 x * x) - 5x^3$

$= > -4 x^3 + 2 x^2 - 5 x^3$

$=> -4x^3 - 5 x^3 + 2x^2$ Grouping like terms.

$=> -x^3 (4 + 5) + 2 x^2$

$=> -9x^3 + 2x^2$

How do you multiply -x (4x^2 - 2x) - 5x^3-x (4x^2 - 2x) - 5x^3?