Question

Choose the correct simplification of 9x2(4x + 2x2 − 1). 18x4 + 36x3 − 9x2 18x4 − 36x3 + 9x2 36x4 + 18x3 − 9x2 36x4 − 13x3 + 9x2

Answer 1

Distribute 9x^2 to all terms in parentheses:


`9x^(2) * 4x = 36x^(3)`

`9x^(2) * 2x^(2) = 18x^(4)`

`9x^(2) * -1 = -9x^(2)`


`18x^4 + 36x^3 - 9x^2`

The answer is 18x^4 + 36x^3 − 9x^2.