What is the greatest common factor of 90xy3 and 12xy?

Answer 1

90xy3 = 2 * 32 * 5 * x * y3

12xy = 22 * 3 * x * y

To find the GCF, you find the highest amounts of each prime factor (2,3,5) and variable (x,y) that are common to both. In this case, one 2, one 3, one x and one y are common.

Then multiply these together:

2 * 3 * x * y = 6xy