Which mathematical statement is correct?

a.(2x-y) (3x-y) =6x to the power of 2 -5xy + y squared
b.(4x-5) (4x-5) = 16x squared -40x + 25
c.(3x-4) (2x+7) = 6x squared -13x -28
d.(2x+5)to the power of two =4x squared + 20x +25

plsss answer guizz I need the answer now

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Answers

2016-06-16T21:05:52+08:00
A. (2x-y) (3x-y)
   =6x²-2xy-3xy+y²
   = 6x²-5xy+y²

b. (4x-5) (4x-5)
   =16x² -20x -20x +25
   =16x² - 40x + 25

c. (3x-4) (2x+7)
   = 6x² + 21x - 8x - 28
   = 6x² + 13x - 28

d. (2x+5)²
   =4x²+20x + 25

a, b, & d are correct
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