Question

If x =1 , y =2 find the value of x²+2 xy - y²​

Answer 1

Please refer the attachment above.

Answer 2

Step-by-step explanation:

x² + 2xy – y²

Put x= 1 and y=2

1² + 2×1×2 – 2²

= 1 + 4 – 4

= 1 + 0

= 1