Question

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

Answer 1

answer is 2

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Answer 2

Answer:

a = 2

Step-by-step explanation:

x + a= 0

=> x= -a

P(x) = 2x²+2ax+5x+10

P(-a)= 2(-a²)+2a(-a)+5(-a)+10

0= 2a²-2a²-5a+10

0= -5a +10

-10 = 5a

-10\-5= a

2= a

a = 2