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If (a + b)2 - 2(a + b) = 80 and...

This question belongs to Arithmetic Ability Algebra
Algebra
?

If (a + b)2 - 2(a + b) = 80 and ab = 16, then what can be the value of 3a - 19b?

Answer & Solution
Correct Answer: Option B
By putting a = 8, b = 2
(8 + 2)2 - 2(8 + 2) = 80
8 × 2 = 16
So, 3a - 19b
= 3 × 8 - 19 × 2
= -14
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