(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

[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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# Simple Factoring Problem

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