Question 36143
f(x) = x^2 - 4
a=1,  b=0,  c=-4
Using the Quadratic formula you get:

x=-0+sqrt[0^2-4(1)(-4)}/2 = [sqrt(16)]/2 = 4/2=2
OR
x=-0-sqrt[0^2-4(1)(-4)}/2 = -[sqrt(16)]/2 = -4/2= -2
*[invoke quadratic"x",1,0,-4]

Cheers,
Stan H.