Which of the following quartic functions has x=-1 and x = -3 as its only two real zeros?

y=x^4 - 4x^3 - 4x^2 - 4x - 3

y = -x^4 + 4x^3 + 4x^2 + 4x + 3

y x^4 + 4x^3 + 3x^2 + 4x

x^4 + 4x^3 + 4x^2 + 4x + 3

Step-by-step explanation:

Consider function

Factor it

This function has two real zeros and and two comples zeros (because cannot be factored futher).

Hence, the function has and as its only two real zeros.

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer