Question

(x – y – 3)2

expand with formula​

Answer 1

Answer:

x²+y²+9-2xy+6y-6x

Step-by-step explanation: ²

Using the identity

(a+b+c)² = a²+b²+c² + 2(ab +bc +ca), we get

(x – y – 3)² = [x+(-y)+(-3)]²

=x² + (-y)² + (-3)² + 2 [x(-y) + (-y)(-3) + (-3)x]

= x²+y²+9 + 2[-xy + 3y -3x]

= x²+y²+9-2xy+6y-6x