Question 265322
I'm assuming that you mean {{{2b^2+13b-7=0}}}



{{{2b^2+13b-7=0}}} Start with the given equation


{{{(b+7)(2b-1)=0}}} Factor the left side (note: if you need help with factoring, check out this <a href=http://www.algebra.com/algebra/homework/playground/change-this-name4450.solver>solver</a>)




Now set each factor equal to zero:

{{{b+7=0}}} or  {{{2b-1=0}}} 


{{{b=-7}}} or  {{{b=1/2}}}    Now solve for b in each case



So our answers are 


 {{{b=-7}}} or  {{{b=1/2}}}