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Alexxandr [17]
3 years ago
14

What is the value of the expression x² + 2x - 2xy – 2y + y^2 when x - y = 50 ?

SAT
1 answer:
Mrrafil [7]3 years ago
3 0

<em>x</em> ² + 2<em>x</em> - 2<em>xy</em> - 2<em>y</em> + <em>y</em> ² = (<em>x</em> ² - 2<em>xy</em> + <em>y</em> ²) + 2 (<em>x</em> - <em>y</em>)

… = (<em>x</em> - <em>y</em>)² + 2 (<em>x</em> - <em>y</em>)

… = 50² + 2 × 50

… = 2600

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