Question

1. If 5x - 2y = 7 and xy = 2, find the value of (5x + 2y)^2​

Answer 1

Answer:

5x=5X2

x is 2

2y=2X1.5

y=1.5

then answer is

(5x+2y)^2

[(5X2)+(2X1. 5)]^2

[10+3]^2

13^2

169 is an answer

Answer 2

Answer:

-

(5x+2y)^2-(5x-2y)^2= 40xy

(5x +2y)^2 = (5x-2y)^2+40xy

= 7^2+40x2=49+80=129