Factorise 25 x square + 30 Xy +9 y square -4 Z Square
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Answer:
25x^2+30xy+9y^2-4z2
(5x) ^2+2×5x×3y+(3y) ^2-4z^2
(5x+3y) ^2-(2z) ^2
(5x+3y-2z) (5x+3y+2z)
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