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25 April, 21:45

What is the product? (9t - 4) (-9t - 4) - 81t2 - 16 - 81t2 16 - 81t2 - 72t 16 - 81t2 72t 16

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  1. 25 April, 22:03
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    We have to find the product : (9 t - 4) ( - 9 t - 4) = - (9 t - 4) (9 t + 4) After that we can use the difference of squares. The formula is: (a + b) (a - b) = a^2 - b^2. In this case: - (9 t - 4) (9 t + 4) = - (81 t^2 - 16) = - 81 t^2 + 16. Answer: B) - 81 t^2 + 16.
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