Question

If 9 X square + 25 y square is equals to 11 and x y is equals to minus 6 find the value of 3 X + 5 y

Answer 1

Step-by-step explanation:

Given,

9x^2 + 25y^2 = 11

xy = -6

To find 3x + 5y

Now

(3x+5y)^2 = 9x^2 + 25y^2 + 30xy

Now ,

Pit respectively value we get,

(3x+5y)^2 = 11 + 30(-6)

(3x+5y)^2 = 11 - 180

(3x+5y)^2 = -161

(3x+5y) = √-161 ans