Question

If 9x 2 + 25y 2 =181 and xy= -6 find the value of 3x+5y.

Answer 1

(3x+5y)² = 9x²+25y²+2×3x×5y = 181+30×(–6)
(3x+5y)² = 181–180 = 1
3x+5y = 1

Answer 2

Answer:

Step-by-step explanation:

(3x+5y)² = 9x²+25y²+2×3x×5y = 181+30×(–6)

(3x+5y)² = 181–180 = 1

3x+5y =1