Is x=3 a zero of f(x)=4x^4-x^3-52x^2-35x+12

no

Step-by-step explanation:

If x = 3 is a zero, then f(3) = 0

f(3)

= 4 - 3³ - 52(3)² - 35(3) + 12

= 324 - 27 - 468 - 105 + 12

= - 264

Since f(3) ≠ 0 then x = 3 is not a zero of f(x)

x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7