Question

If 5x – 2y = 6 and xy = 4, find 25x274 4y2.​

Answer 1

Step-by-step explanation:

Consider the given equation,

5x−2y=7 and xy=2

We have to find (5x+2y)2=?

Now,

(5x−2y)2=25x2+4y2−20xy

72=25x2+4y2−20×2

25x2+4y2=89

Now,

(5x+2y)2=25x2+4y2−20xy

(5x+2y)2=89−20×2

(5x+2y)2=49