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Find the polynomial if given q(x) = x\(^2\) - x - 5, d(x) = ...

Find the polynomial if given q(x) = x\(^2\) - x - 5, d(x) = 3x - 1 and r(x) = 7.

A.

3x\(^3\) - 4x\(^2\) - 14x + 12

B.

3x\(^2\) + 3x - 7

C.

3x\(^3\) + 4x\(^2\) + 14x - 12

D.

3x\(^2\) - 3x + 4

Correct answer is A

Given q(x) [quotient], d(x) [divisor] and r(x) [remainder], the polynomial is gotten by multiplying the quotient and the divisor and adding the remainder.

i.e In this case, the polynomial = (x\(^2\) - x - 5)(3x - 1) + 7.

= (3x\(^3\) - x\(^2\) - 3x\(^2\) + x - 15x + 5) + 7

= (3x\(^3\) - 4x\(^2\) - 14x + 5) + 7

= 3x\(^3\) - 4x\(^2\) - 14x + 12