Question

0.00
If 9x² + 25 y2 = 181 and xy=-6, find the value of 3x + 5 y
If 3x – 7y=10 and xy =-1, find the value of 9x² +49y2
5.
.
E​

Answer 1

Answer:

$(x + y)^{2} = {x}^{2} + {y}^{2} + 2xy$

1. 1

2. 58

Step-by-step explanation:

1.

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

$(3x + 5y) ^ {2} = 181 - 180 \\ = 1 \\ 3x + 5y = \sqrt{1}$

sqrt1=1

so,3x+5y=1