use formula to multiply : i) (2a-13) (2a+13)
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the answer is 4a2-26 we apply the formula a2-b2
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(2a-13) (2a+13)
(2a)^2 - (13)^2 {a^2-b^2 = (a+b)(a-b)}
4a^2 - 169
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