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29 March, 11:17

Perfect square trinomial: (a - b) 2 = (a - b) (a - b) = a2 - 2ab + b2 Find the product of (k - 9) 2 using the perfect square trinomial rule shown on the left. The product (k - 9) 2 can also be written as

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  1. 29 March, 13:02
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    K^2 - 2 (9) k + 9^2

    Or

    k^2 - 18k + 81

    Just sub in k for a and 9 for b.
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