66.4k views
5 votes
What is the value of the expression
x² + 2x - 2xy – 2y + y^2 when x - y = 50 ?

User Cocacrave
by
6.4k points

1 Answer

3 votes

x ² + 2x - 2xy - 2y + y ² = (x ² - 2xy + y ²) + 2 (x - y)

… = (x - y)² + 2 (x - y)

… = 50² + 2 × 50

… = 2600

User Sergio
by
6.9k points