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Question

5 times a number is 4 more than its square the number is

A
3
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B
4
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C
5
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D
6
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Solution

The correct option is B 4
Let the number be x
According to the question,
5x=4+x2
x25x+4=0
x24xx+4=0
x(x4)1(x4)=0
(x4)(x1)=0
x=4 or x=1
The required number is 4.

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