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How do you factor by grouping #3x^3 y - 9x^3 + 6x^2 y - 18x^2#?

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May 4, 2015

#3x^3y-9x^3+6x^2y-18x^2#

#= color(red)((3x^3y-9x^3)) + color(blue)((6x^2y-18x^2))#

#= color(red)((3x^3)(y-3)) + color(blue)((6x^2)(y-3))#

#=(3x^3+6x^2)(y-3)#

#=(3x^2)(x+2)(y-3)#

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