Question

If p(x)=x3 +x2 +ax+115 is exactly divisible by (x+5) then a is

Answer 1

Answer:

p(x)=0

p(-5)=(-5)3+(-5)2+a(-5)+115=0

-125+25-5a+115=0

-5a+15=0

-5a=-15

a=-15/-5

a=3

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