Question

Question 1 of 10

Which expression is the simplest form of - (3x³ + x²) +2 (x³ - 4x²)?
OA.-2³-32²
OB.-2³-92²
O C. 5x³-7x2²
OD. 52³-82²
SUBMIT

Answer 1

Answer:
`\Large\boxed{-x^3-9x^2}`

Hi there! By my calculation, I got the answer above. However, it doesn't fit any one of the answer choices. I am not sure if I am totally correct, but I have been double-checking my answers. Please let me know whether it's the answer choices mistaken or I am wrong so that I could modify my answer if necessary.

Explanation:

Given expression

- (3x³ + x²) +2 (x³ - 4x²)

Expand parenthesis by the distributive property

= -3x³ - x² + 2x³ - 8x²

Combine like terms

= -3x³ + 2x³ - x² - 8x²

`\Large\boxed{=-x^3-9x^2}`

Hope this helps!! :)

Please let me know if you have any questions

Answer 2

B. -x³ - 9x².

Explanation:

- (3x³ + x²) +2 (x³ - 4x²)

= -3x³ + 2x³ - x² - 8x²

= -x³ - 9x²