If we start with x2 + 4 = 0, the next conclusion is that x2 = -4. All real numbers have a positive result when multiplied by themselves, so therefore we are dealing with an imaginary number. The square root of minus four is 2i.
It is: 3x2+6x-11 = 0
63828
It is a quadratic equation.
Solve this problem -x squared -40x- 80 =0
x = -½
4
It is a quadratic equation in the variable x.
If you mean: x2+9x+20 then it is (x+4)(x+5) = 0 when factored
4, -5
3x(2x + 1)
(x + 3)(x + 2)
(2x-4)(x-1) = 0