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 .

.

Substitute p = 81 into equation (1) to find the value of n.

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