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Mathematics
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Multiply. Assume that no denominator equals zero.
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@AJ01
@rational
(x^2-16)/(x^2+3x) * (x+3)/(x^2-4x)
(A^2-B^2)=(A+B)(A-B)
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so (x^2-16)=(x^2-4^2)=(x+4)(x-4)
(x^2-4x)=x(x-4)
x^2+3x =x(x+3)
(x+4)(x-4)/x(x+3) *(x+3)/x(x-4) =(x+4)/x *1/x
(x+4)/x^2
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