Question

If 4x2+ y2= 40 and xy = 6, find the value of 2x + y and 2x – y.

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

Given,

4x²+y²=40, xy=6

Hence, (2x+y)²= (2x)²+2*xy+(y)²= 40+2*6= 52

Or, 2x+y= √52=2√13

(2x-y)²=(2x)²-2*xy+(y)²= 40-2*6

Or , 2x-y = √ 28= 2√7