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Question

If A2 − 15 = 5A, evaluate A.

A
7
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B
8
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C
3
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D
6
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Solution

The correct option is A 7
A2 − 15 = 5A can be written in the following way:

(10A+2)(10+5)=50+A 10A13=50+A 9A=63 A=7

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