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Using a^2 – b^2 = (a + b) (a – b), finds 51^2 - 49^2

Q : 7          Using    a^2-b^2=(a+b)(a-b),    find

                  (i) 51^2-49^2

Answers (1)
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We know,

a^2-b^2=(a+b)(a-b)

Using this formula,

51^2-49^2 = (51 + 49)(51 - 49)

= (100)(2)

= 200

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