Question

9 (x-y)^2-9 (x+y)(x-y)

Answer 1

Answer

This answer is 18y • (y - 1)

Explanation

Step by step solution:

Equation at the end of step 1:

$9 (x - y) ^2 - 9 (x^{2} - y^{2})$

Equation at the end of step 2:

$9 (x^2 + y^2 - 2xy) - 9 (x^2 - y^2)$

Equation at the end of step 3:

$9x^2 + 9y^2 - 18xy - 9x^2 + 9y^2$

Equation at the end of step 4:

After performing basic +, - operation we get:

$18y^2 - 18xy$

Answer is: 18y. (y – x)