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1. a2-b2

A. 16
B. 16
C. 16
D. 16

Answer: Option B

Explanation:

G i v e n, a + b = 8, a b = 12 ∴ a^{2} - b^{2} = (a + b) (a - b) = 8 \times 4 = 32 ∴ a^{2} - b^{2} = 32 B u t w e k n o w, (a - b) = \sqrt{{(a + b)}^{2} - 4 a b} = \sqrt{64 - 48} = \sqrt{16} = 4

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