Question

find the value of a if P(X) = x³-3x
+ ax -15 leave remainder when divided by x-3​​

Answer 1

Given :-

x³ - 3x + ax - 15

To Find :-

Value of a

Solution :-

x - 3 = 0

x = 0 + 3

x = 3

Now

0 = (3)³ - 3(3) + a(3) - 15

0 = 27 - 9 + 3a - 15

0 = 27 - 24 + 3a

0 = 3 + 3a

-3 = 3a

-3/3 = a

-1 = a

Value of a is -1

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