What Is The Greatest Common Factor Of 63x 2y 9x 3y 2 90x 3y 4 Amp Factor Out Th

what is the greatest common factor of -63x^2y, 9x^3y^2, 90x^3y^4

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Factor out the gcf from this:  a^5b^4-a^3b^2+a^2b^7-a^2b^2

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