Question

13. Simplify: (x + y + x)2 – (x – y + z)2​

Answer 1

Answer:

x^2+y^2+x^2+2xy+2xy+2x^2 -(x^2 +y^2+z^2 -2xy-2yz+2xz)

x^2 +y^2+ x^2+ 2xy+ 2xy+ 2x^2 -x^2 -y^2-z^2 +2xy+2yz-2xz

2x^2 +6 xy +2 x^2 -x^2 -z^2 +2yz -2xz

3x^2+6xy-z^2 +2yz-2xz

please read the process carefully

ans is correct