- #1
Rowah
- 17
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Homework Statement
[tex]28s^2 + 8st - 20t^2[/tex]
The answer in the back of the book is 4(7s - 5t)(s + t)
2. The attempt at a solution
[tex]4(7s^2 + st + st - 5t^2)[/tex]
[tex]4(7s^2 + st + st - 20t^2)[/tex]
[tex]4(s(7s + t) + t(s - 20t))[/tex]
I'm lost, can someone please help me?
Thanks in advance.
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