How did they rearranged the following formula

[Krack]

Hello.

Can someone please help me understand how the following formula was re-arranged to isolate fo qs.



Any specific material that you guys know that could help me understand this?

Thank you.

 

[lev888]

Factor out [imath]σ_s[/imath]. You now have [imath]σ_s * blah1 = blah2[/imath]. Can you isolate it now?

 

[BigBeachBanana]

They just factored out [imath]\sigma_s[/imath], and divide.
[math]\sigma_s\left(\frac{A_s}{E_bA_b}+\frac{1}{E_s}\right)[/math]

 

[Krack]

Thanks fellas.