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

Question

Mathematics

Moody

11 November, 11:36

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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Answers (1)

Know the Answer?

Jovani Hale · Answer 1

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)