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प्रश्न
Use a formula to multiply of (2a – 13)(2a + 13)
बेरीज
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उत्तर
We use the formula: (x - a)(x + a) = x2 - a2
(2a – 13)(2a + 13)
= (2a)2 - 132
= 4a2 - 169
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