Vidyalelo
Aptitude · Q412

Algebra

Competitive Exams · Aptitude · question 412

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
Answer
C.
-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