Jielinnn
Jielinnn
14-06-2016
Mathematics
contestada
Factorise
30y^2 - 33yz - 18z^2
Respuesta :
caylus
caylus
15-06-2016
Hello,
30y²-33yz-18z²=3(5y+2z)(2y-3z)
Since
Let's assume u=y/z
30y²-33yz-18z²=3(10y²-11yz-6z²)
=3z²((10(y/z)²-11(y/z)-6)
=3z²*(10u²-11u-6)
=3z²*(5u+2)(2u-3)
=3z²*(5y/z+2)(2y/z-3)=3z²(5y+2z)(2y-3z)/z²
=3(5y+2z)(2y-3z)
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