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Sloan [31]
4 years ago
5

If x+y=15 and x-y=25, then what is the value of 2x^2 - y^2?

Mathematics
2 answers:
elena55 [62]4 years ago
4 0
X+y = 15
x-y = 25
------------
2x = 40
x = 40/2
x = 20

y = 15-x
y = 15-20
y = -5

2x² - y² = 
2*20² - (-5)² =
2*400 - 25 = 
800 - 25 = 
775
patriot [66]4 years ago
3 0
The answer is B as since x = 20 and y = -5
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