If 4x2 + y2 = 40 and xy = 6, then find the value of 2x + y.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 8
Given that
If 4x2 + y2 = 40 and xy = 6
(2x + y)2 - 4xy = 40
(2x + y)2 = 40 + 4 × 6 = 64
2x + y = 8