factorise the following 9 X square + 6 X + 1 - 25 y square
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9 X square + 6 X + 1 is equals to 3 X + 1 whole square 25 y whole square is equals to 5 y whole square therefore 9 X square + 6 X + 1 -25 y square is equals to 3 X + 1 whole square - 5 y whole square which is equals to 3 X + 1 - 5 y into 3 X + 1 + 5 y
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