Question 84571
The given expression is: 

{{{ 14^2 = 13x + 12 }}}


This can be written as: 


{{{ 14x^2 - 13x - 12 = 0}}} 


Using the quadratic formula, we get: 


{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}  


{{{x = (13 +- sqrt( 169-4*(14)*(-12) ))/(2*14) }}} 



{{{x = (13 +- sqrt( 169 + 672) ))/(28) }}} 


{{{x = (13 +- sqrt(841) ))/(28) }}} 


{{{x = (13 + - 29) ))/(28) }}} 


{{{ x = 42/28 }}} OR {{{x = -16/28}}}