bewellplus.gsu.edu
tif6f4angilion tif6f4angilion
  • 21-11-2016
  • Mathematics
Answered

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

A425
B775
C825
D1,575
E1,625 ...?

Verified Answer :

antonsandiego
antonsandiego antonsandiego
  • 21-11-2016

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.

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