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26 October, 12:15

What polynomial identity will prove that 49 = (2+5) ^2? (A. Difference of Squares; B. Difference of Cubes; C. Sum of Cubes; D. Square of a Binomial)

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  1. 26 October, 13:23
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    Hi,

    (a+b) ² = a²+2ab+b²

    For a = 2 and b = 5

    (2+5) ² = 2²+2 (2) (5) + 5²

    (2+5) ² = 4+20+25

    (2+5) ² = 49

    Answer:

    D. Square of a Binomial
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