SOLUTION: Show steps in factoring the following expression: 21y^+72y-48

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Question 729482: Show steps in factoring the following expression: 21y^+72y-48
Answer by MathLover1(20855) About Me  (Show Source):
You can put this solution on YOUR website!

21y%5E2%2B72y-48.....first factor out 3
3%287y%5E2%2B24y-16%29.......write 24y as -4y+%2B28y
3%287y%5E2-4y+%2B28y-16%29....group
3%28%287y%5E2-4y%29%2B%2828y-16%29%29
3%28y%287y-4%29%2B4%287y-4%29%29
3%28y%2B4%29%287y-4%29