A quadratic equation in the variable x is of the form ax2+bx+c=0, where a,b,c are real numbers and a is not equal 0.
A quadratic equation can also be solved by the method of completing the square.
A quadratic equation ax2+bx+c=0 has
D = b2-4ac
1) D > 0 then two distinct real roots
2) D = 0 then two equal roots
3) D < 0 then no real roots