Factor completely: -6x4y5 - 15x3y2 + 9x2y3

Question

phi · Answer

These are not too hard if you do the following:
the the letters raised to a power,  the letter has to be in every term. If it is, take the one with the smallest power.   For example, in this one you have x^4  x^3 and x^2  so x is in every term.  choose x^2 as part of your GCF.
for the numbers, break them into their primes  
e.g.  6= 2*3
15= 3*5
9=3*3
look for anything in common  (you can treat the numbers like letters if you want and use the rule up above)

anonymous · Answer

$$-3 x^2 y^2 \left(2 x^2 y^3+5 x-3 y\right)
$$