If A2 + 15 = 8A, evaluate A.

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Solution

A2 + 15 = 8A can be written in the following way:

$\Rightarrow (10 A + 2) + (10 + 5) = 80 + A \Rightarrow 10 A + 17 = 80 + A \Rightarrow 9 A = 63 \Rightarrow A = 7$

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