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

Mathematics
JAMB 2019

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
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Correct Answer: Option A
Explanation

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

There is an explanation video available below.


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Explanation Video

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts