Question

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Answer 1

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Step-by-step explanation:

a)

= 2(2x-5y)(3x-4y) - 6(2x-5y)(x-y)

=2x-5y(2(3x-4y)-6(x-y))

= 2x - 5y (6x - 8y - 6x + 6y)

= 2x - 5y ( - 2y)

= -4xy + 10y²

b)

=  xy (3x²-2y²) - yz(2y²-3x²)+zx(15x²-10y²)

= xy(3x²-2y²) + yz(3x²-2y²) + 5zx(3x²-2y²)

= (3x²-2y²) (xy+yz+5zx)