Question
The sum of a positive number 'A' and its square is 156.
Find the value of (A2 - 7A).Solution
ATQ; A + A2 = 156 Or, A2 + A - 156 = 0 Or, A2 + 13A - 12A - 156 = 0 Or, (A + 13)(A - 12) = 0 So, A = 12 or A = -13 Since, 'A' is positive. So, required value = 122 - 12 × 7 = 144 - 84 = 60
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