Factorise : 4 x square - 12 xy + 9 y square - 25
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4x^2+9y^2-25z^2+12xy
=(2x)^2+(3y)^2+2×2x×3y-25z^2
=(2x+3y)^2-(5y)^2
=(2x+3y-5z)(2x+3y+5z)
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