Answer:
x + 3 is not a factor of the polynomial
Step-by-step explanation:
Using the factor and remainder theorem, if the given expression is a factor, by substituting the value of the expression set to zero , then , we should have 0 as our remaining value after substituting
Set x + 3 to zero
x + 3 = 0
This means;
x = -3
so;
f(-3) = -3^3 -5(-3) + 10(-3) - 12
= -27 + 15 -30 -12
= -54
Since what we have is not equal to zero, then x + 3 is not a factor of the polynomial
