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OpenStudy (anonymous):
What polynomial identity should be used to prove that 21 = 25 - 4? A. Difference of Cubes B. Difference of Squares C. Square of Binomial D. Sum of Cubes
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OpenStudy (anonymous):
I think its C but I'm not sure.
OpenStudy (anonymous):
Ans-B 5^2 -2^2=21
OpenStudy (anonymous):
I don't get it?
OpenStudy (anonymous):
21=(5^2)-(2^2)
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