How do you simplify $(-12x^3+5x-23)-(4x^4+31-9x^3)$ ?

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Answer 1 · 2018-06-06T11:25:15

$=-4x^4-3x^3 +5x-54$

In order to simplify you need to add the like terms.

Remove the brackets first.

$(-12x^3+5x-23)color(red)(-(4x^4+31-9x^3))$

$= -12x^3+5x-23 color(red)(-4x^4-31+9x^3)" "larr$ note the signs

$=-4x^4-12x^3+9x^3 +5x-23-31" "larr$ re-arrange

$=-4x^4-3x^3 +5x-54" "larr$ add like terms

How do you simplify (-12x^3+5x-23)-(4x^4+31-9x^3)(-12x^3+5x-23)-(4x^4+31-9x^3)?