if x-1 is a factor of x3+ ax2 - a x + b when the expression is divided by x-2 the remainder is 15 find a and b
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x=1
1+a-a+b=0
b=-1
x=2
8+4a-2a-1=15
a=4
therefore a=4 ,b=-1
1+a-a+b=0
b=-1
x=2
8+4a-2a-1=15
a=4
therefore a=4 ,b=-1
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