Use substitution to determine whether the given number is a zero of the given polynomial.
-3; $f ( x ) = - x ^ { 4 } - 8 x ^ { 2 } - 5 x + 168$
A) Yes
B) $\mathrm { No }$

Question

Quizplus · Accepted Answer

Substituting $x = 3$ into the polynomial $f(x) = -x^4 - 8x^2 - 5x + 168$, we get $-3^4 - 8(3)^2 - 5(3) + 168 = -81 - 72 - 15 + 168 = 0$. Since the result is 0, 3 is a zero of the polynomial.

Use Substitution to Determine Whether the Given Number Is a Zero