Question

.If x+a is a factor of 2x^2 +2ax +5x +10 , find a



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Answer 1

Answer:

divide the factor by the polynomial and then by creating X + a by the remainder you will get the value of a

Answer 2

Answer:

X+a is a factor of 2x²+2ax+5x+10

therefore f(-a)=0;

substituting values,

2(-a)²+2(a)(-a)+5(-a)+10=0

2a²-2a²-5a+10=0

-5a+10=0

therefore a=2