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Which binomial could be rewritten as a difference of two squares? A) x^2 + y^2 B) 4x^2 − 11y^2 C) 7x^2 − 21y^2 D) 25x^2 − y^2

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jcherry99

Answer:

D

Step-by-step explanation:

A: Difference means minus. A has no minuses anywhere. Not the answer.

B: Could be true if you allow irrational numbers. I'm guessing you are not allowed to give (2x - sqrt(11)y)(2x + sqrt(11)y). So B is not the answer

C: Take out the 7 as a common factor. 7(x^2 - 3y^2) If you allow C, you have to allow B so C is not the answer.

D: answer (5x - y)(5x + y)

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