x, y are two positive numbers such that x > y. If $x^4 + y^4 = 706$ and xy = 15, then the value of 2x + 3y is :
Answer & explanation
Correct answer: option 1
If $x^4 + y^4 = 706$
xy = 15
then the value of 2x + 3y is= ?
We can break 15 in 3 and 5
So Put the value of one as 5 and another as 3
2x + 3y = 2(5) + 3(3) = 10 + 9 = 19