Remainder
When is divided by , the remainder is . Find the numerical value of .
The answer is -7.
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1 solution
By remainder theorem,
f ( x ) = x 3 + a
f ( − 2 ) = ( − 2 ) 3 + a = − 1 5
It follows that
− 8 + a = − 1 5
a = − 1 5 + 8
a = − 7 answer