factorise x^+3x+2+ax+2a
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{x^2+2x+x+2}+a(x+2)
x(x+2)+1(x+2)+a(x+2)
(x+2)(x+a+1)
is your answer
x(x+2)+1(x+2)+a(x+2)
(x+2)(x+a+1)
is your answer
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