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Mathematics · Algebra · page 8 of 8

Quadratic Equations MCQs with Answers

Includes 12 past paper MCQs (marked).

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Quadratic Equations MCQs (71–72)

2 MCQs with answers and a short one-liner. Hide answers to test yourself.

Past paper MCQs in this chapter · See all past papers

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71.
Past Paper MCQ
A positive number when decreased by 4 is equal to 21 times the reciprocal of the number. The number is?
Correct Answer: C. $7$
One-liner
Let the number be $x$; then $x - 4 = \frac{21}{x}$ gives $x^2 - 4x - 21 = 0$, so $x = 7$ (positive root). The number is $7$.
72.
Past Paper MCQ
Solve: $x^2 + 18x + 81 = 0$. What is the factor form?
Correct Answer: D. $(x + 9)^2$
One-liner
The factor form of $x^2 + 18x + 81 = 0$ is $(x + 9)^2$.

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