Question

which of the following correctly simplifies (-7x^4 + 6x^2 + 5) - (2x^4 - 8x^2 + 5)

-9x^4 + 14x^2
-9x^4 + 14x^2 + 10
-7x^4 + 6x^2 + 5 - 2x^4 + 8x^2 - 5
-9x^4 - 2x^2 + 10

Answer 1

(-7x^4 + 6x^2 + 5) - (2x^4 - 8x^2 + 5)
= -7x^4 - 2x^4 + 6x^2 + 8x^2 + 5 - 5
= -9x^4 + 14x^2

So the correct choice is: -9x^4 + 14x^2.