if it is 3x + 9y, then 3(x+3y)
or if it is a product...then it doesn't make sense, since then 3x9y=27xy
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Factorising 15x-27xy gives 3x (5 - 9y).Factorising is to express a number or expression as a product of factors.When factorising always look for common factors. To factorise (15x-27xy) look for the highest factor between the two terms (3x). 15x - 27y = 3x (5 - 9y)
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factor out a 3x 3x(x-3)=3x2-9x
Since 3x is a factor of 3x^2, it is automatically the GCF.
Since 3x is a factor of 12x, it is automatically the GCF.