Question
The sum of a positive number 'A' and its square is 90.
Find the value of (A2 - 7A).Solution
SolutionĀ ATQ; A + A2 = 90 Or, A2 + A - 90 = 0 Or, A2 + 10A - 9A - 90 = 0 Or, (A + 10)(A - 9) = 0 So, A = 9 or A = -10 Since, 'A' is positive. So, required value = 92 - 9 Ć 7 = 81 - 63 = 18
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