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Simplifying Expressions

How do you use rules when solving these problems? Is it always possible?
(x³-y³) - (-6x³+x²y-xy²+2y³)

(3x-y)(2x+5y)

(7xy²-10y)(7xy²+10y)

(xy+ab²)(xy-ab²)

Solution Summary

Expressions are simplified. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.

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