SOLUTION: How would you factor out the greatest common factor in this problem? 21b^4-14b^2

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Question 124947: How would you factor out the greatest common factor in this problem?
21b^4-14b^2
Answer by chitra(359) About Me  (Show Source):
You can put this solution on YOUR website!
The given expression is:

21b%5E4+-+14b%5E2

Here we observe that b^2 is the highest factor among the variables.

Then among the numbers both are multiples of 7. so take out 7 as a common factor.

7b%5E2%283b%5E2+-+2%29


Thus the solution.