Factorise: 4x square+25y square+9z square-20xy-30yz+12zx
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4x²+25y²+9z²–20xy–30yz+12zx
= (2x)²+(5y)²+(3z)²–20xy–30yz+12zx
= (–2x+5y–3z)²
= (2x)²+(5y)²+(3z)²–20xy–30yz+12zx
= (–2x+5y–3z)²
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