we have the quadratic equation
[tex]u^2-u-12=0[/tex]
we have that
a=1
b=-1
c=-12
Applying the formula to solve a quadratic equation
[tex]u=\frac{-(-1)\pm\sqrt{-1^2-4(1)(-12)}}{2(1)}[/tex][tex]u=\frac{1\pm7}{2}[/tex]
The values of u are
u=4 and u=-3
therefore
The answer is
u=-3,4
