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If x+y=15 and x-y=25, then what is the value of 2x^2 - y^2? A) 425 B) 775 C) 825 D) 1,575 E) 1,625 ...?

If x+y=15 and x-y=25, then what is the value of 2x^2 - y^2? A) 425 B) 775 C) 825 D) 1,575 E) 1,625 ...?
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If x+y=15 and x-y=25, then what is the value of 2x^2 - y^2?

A) 425
B) 775
C) 825
D) 1,575
E) 1,625 ...?

User Joe Consterdine
by
7.8k points

1 Answer

2 votes
I suggest you to use this fromula to solve it: (x−y)(x+y)=x^2−y^2. I'll help you by telling what the values of x and y. y= -5, x = 20. Just put it there and you'll get the answer.
User Drekka
by
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User Antonieta
asked Sep 4, 2017 190k views
If x+y=15 and x-y=25, then what is the value of 2x^2 - y^2? A) 425 B) 775 C) 825 D) 1,575 E) 1,625 ...?
Antonieta asked Sep 4, 2017
by Antonieta
8.6k points
2 answers
0 votes
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