when ax²+7x+12 is divided by x-3 the remainder is 51 then find a
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x-3=0
x=3
By remainder theorem,we know that when p(x)is divided by (x-3),the remainder is p(3)
p(x)=ax²+7x+12
p(3)=a(3)²+7(3)+12
=>9a+21+12=51
=>9a+33=51
=>9a=18
=>a=18/9
=>a=2
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