How do you find greatest common factor in an expression?

Answer 1

Let's try one.

30x2y3z4 + 42x4y5z2

Do the numbers first.

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Select the common factors.

2 x 3 = 6

For the variables, select the lowest exponents.

The GCF of the above expression is 6x2y3z2