factorise 4x²+9y²-25z²+12xy
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4x²+9y²-25z²+12xy
=(4x²+9y²+12xy)-25z²
=(2x+3y)²-(5z)²
=(2x+3y+5z)(2x+3y-5z)
=(4x²+9y²+12xy)-25z²
=(2x+3y)²-(5z)²
=(2x+3y+5z)(2x+3y-5z)
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