Question

if (x-a) is a factor of x^2+3ax-20 then a=?​

Answer 1

Answer:

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Answer 2

Answer:

Let P(x)=x

2+3ax−2a

Given, (x−2) is a factor of P(x)

x−2=0

x=2

∴P(2)=0

⇒2 ^2 +3a(2)−2a=0

⇒4+4a=0

⇒a=−1