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x-y=7

(x-y)^2 - 5x+5y

Guest Mar 13, 2017
 #1
avatar+7153 
+2

x - y = 7

(x - y)2 - 5x+5y

I'm guessing that you're trying to figure out what the second expression equals when you use the information from the first equation.

First just look at this second expression.

(x - y)2 - 5x+5y

 

Factor out a -5 from the last two terms.

(x - y)2 - 5(x - y)

 

Now substitute 7 in for every (x - y).

72 - 5(7)

 

49 - 35 = 14

hectictar  Mar 13, 2017

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