Question

x2+y2 = 45 and xy = 5/10 then 4 (x+y)2 – (x-y)2 = ?

Answer 1

Answer:

178(x-y)

Step-by-step explanation:

Question                                      x= multiplecation

x2+y2= 45

xy= 5/10

then

4(x+y) 2- (x-y )2 =?

So,

2x+ 2y= 45

2(x+y)= 45

x+y= 45/2

4 (x+y) x 2-(x-y)2

4 (45/2) x 2-(x-y)2

4 x 45/2 x 2-2x-2y

=180-2x-2y

=180 -2(x-y)

=178(x-y)

This is where I could figure it out

Hope it helps