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प्रश्न
Use a formula to multiply of (2a – 13)(2a + 13)
योग
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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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अध्याय 15.5: Miscellaneous Problems : Set 2 - Exercise [पृष्ठ १००]
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