Question

if 9x²2+25y² = 181 and xy= -6, find 3x+5y. ​

Answer 1

Answer:

ok

Step-by-step explanation:

3x+5y= -18+(-30)

-18-30= -48

Answer 2

Step-by-step explanation:

9x² + 25y² =181

(3x)² + (5y)² =181

add 2*3x*5y = 30xy = 30*(-6) = -180 on both sides

(3x)²+(5y)² + 2*3x*5y = 181 -180

lhs is in the form a2+2ab+b2 = (a+b)²

(3x+5y)² =1

3x+5y =+/- 1