Question

Factorise x^2+y^2+2xy-z^2​

Answer 1

Answer:

(x+y-z)(x+y+z)

Step-by-step explanation:

x²+y²+2xy-z²

=>{(x)²+(y)²+2(x×y)} - (z)²                          (a+b)²=a²+2ab+b²

=>(x+y)² - (z)²                                          (a-b)(a+b)=a²-b²

=>(x+y-z)(x+y+z)

HOPE THE ANSWER IS CORRECT.