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Question
Use a formula to multiply of (2t – 5)(2t + 5)
Sum
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Solution
We use the formula: (x – a)(x + a) = x2 – a2
(2t – 5)(2t + 5)
= (2t)2 – (5)2
= 4t2 – 25
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Chapter 15.5: Miscellaneous Problems : Set 2 - Exercise [Page 100]
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