14 (3y-5z)^2-21 ( 5z -3y)^3
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14(3y-5z)^2 - 21(5z-3y)^3
=14(9y^2 - 30yz + 25z^2)- 21( 125z^3-225yz^2+ 135zy^2 - 27y^3)
=(126y^2-420yz+350z^2)- ( 2625z^3- 4725yz^2+2835zy^2-576y^3)
=126y2-420yz+350z^2-2625z^3+4725yz^2-2835zy^2+567y^3
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=14(9y^2 - 30yz + 25z^2)- 21( 125z^3-225yz^2+ 135zy^2 - 27y^3)
=(126y^2-420yz+350z^2)- ( 2625z^3- 4725yz^2+2835zy^2-576y^3)
=126y2-420yz+350z^2-2625z^3+4725yz^2-2835zy^2+567y^3
please mark as brainliest
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