Question 100781
The given expression is: 


{{{ x^2 - 9x - 4 = 6 }}} 



This can be written as:  



{{{ x^2 - 9x - 4 - 6 = 0 }}} 



{{{ x^2 - 9x - 10 = 0 }}} 



Factoring the middle term we get:



{{{ x^2 - 10x + x - 10 = 0 }}}



{{{ x(x - 10) + 1 (x - 10) = 0 }}} 



(x + 1)(x - 10) = 0 



==> x + 1 = 0  Or x - 10 = 0 


==> x = -1 or x = 10 are the roots of the given polynomial.


thus the solution.