Q412
If (a + b)2 - 2(a + b) = 80 and ab = 16, then what can be the value of 3a - 19b?
A.
-16
B.
-14
AnswerC.
-18
D.
-20
Answer: Option B
Solution
Answer: Option B
Solution:
By putting a = 8, b = 2(8 + 2)2 - 2(8 + 2) = 80
8 × 2 = 16
So, 3a - 19b
= 3 × 8 - 19 × 2
= -14