when is exactly divisible by (x+3), it means that when you substitute x = -3 into the the expression it equals to zero.
You will get an equation of p in term of n, name this equation (1)
——(1)
when x=-1 is substituted into the expression it will give a remainder of -80 .
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Substitute p = 81 into equation (1) to find the value of n.
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