alleryFind the numerical value of (a - b)^2 when a + b = 9 and ab = 14.
A35
B45
C15
D25
Answer & Solution
Correct answer: D. 25
Applying (a - b)^2 = (a + b)^2 - 4ab gives 9^2 - 4(14) = 81 - 56 = 25.
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