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= 2x^2+10x-3x-15
=2x^2+7x-15
b.ab(a+2b-c)
=a^2b+2ab^2-c
c.2xy(x^2-3y)
=2x^3y-6xy^2
d.(x+3)(2x-3)
=2x^2-3x+6x-6
= 2x^2+3x-6
b. ab(a+2b-c) = a²b+2ab²-abc
c. 2xy (x²-3y) = 2x³y-6xy²
d.(x+3) (2x-3) = 2x²-3x+6x-9 = 2x²+3x-9