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Solving a Quadratic Equation by Factorization Method

If the remain...

Question

If the remainder obtained by subtracting a number from its own square is 4 time the number, what is the number?

A

4

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B

3

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C

6

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D

5

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Solution

The correct option is D 5
Let the number is x
Then according to the question
$\Rightarrow x^{2} - x = 4 x$
$\Rightarrow x^{2} = 5 x$
$\Rightarrow x = \frac{5 x}{x}$
$\Rightarrow x = 5$

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Similar questions

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B. Add the number to its square.
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D. Multiply the number by 3 and subtract 5 from the result.
E. Subtract one from the square of the number.

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