(apex) which expression is equivalent to (x^2-2x) (3x^2+4x-7)

options are:
a.
x^2(3x^2+4x-7)-2x(3x^2+4x-7)
b.
x^2(3x^2+4x-7)+2x(3x^2+4x-7)
c.
x^2(3x^2+4x)-2x(4x-7)
d.
x^2(3x^2+4x-7)-2x

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