Question

if(x+a) is a factor of 2x2+2ax+5x+10​

Answer 1

x+a=0

x= - a

P(x) =2x^2+2ax+5x+10

P(-a) =2(-a)^2+2a(-a)+5(-a)h10

=2a^2-2a^2-5a+10

=-5a+10

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