Question

x square plus y square is equal to 34 and xy is equal to 21 by 2 find the value of 2 (x+ y)^2+(x-y)^2

Answer 1

2(x+y)^2+(x-y)^2
2x^2+2y^2+4xy+x^2+y^2-2xy
3x^2+3y^2+2xy
3(x^2+y^2)+2xy
3(34)+2(21/2)
102+21
123

hope this helps:p