Question by Summer Clouds - Discuss with MathYouLike

Summer Clouds moderators

25/07/2017 at 08:47

Find the value of expression \(A=x^2-5x-2xy+5y+y^2+4\) with \(x-y=1\).

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Kayasari Ryuunosuke Coordinator 25/07/2017 at 12:06

A = x² - 5x - 2xy + 5y + y² + 4

A = (x² - 2xy + y²) - (5x - 5y) + 4

A = (x - y)² - 5(x - y) + 4

A = 1² - 5.1 + 4

A = 1 - 5 + 4

A = 0
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