: If ( x + 3 ) is factor of the polynomial kx^3 + x^2 - 22x - 21 ,then find the value of k.
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Answer:
x=2
Step-by-step explanation:
x+3=0
x=-3
so substitute x with -3
kx(-3)³+(-3)²-22x-3-21=0
-27k+9+66-21=0
-27k+75-21=0
-27k+54=0
-27k=-54
k=-54/-27
k=2
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