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By expanding the brackets show that a (x 5)(x 5) x2 25 b (2x 3)(2x 3) 4x2 9 c (9x 7)(9x 7) 81x2 49 What

By expanding the brackets show that a (x 5)(x 5) x2 25 b (2x 3)(2x 3) 4x2 9 c (9x 7)(9x 7) 81x2 49 What do you notice about the above results? Show that This is known as the difference between two squares and is an important result.

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