x = 2.5 + sqrt(29)
and
x = 2.5 - sqrt(29)
x2+4x-9 = 5x+3 x2+4x-5x-9-3 = 0 x2-x-12 = 0 (x+3)(x-4) = 0 x = -3 or x = 4
Factors (x - 7)(x + 2) so x = 7 or -2.
It has no solutions because the discriminant of the quadratic equation is less than zero.
If you mean: x2+5x+4 = 0 then the solutions are x = -1 and x = -4
x2 + 5x + 3 = 9 x2 + 5x - 6 = 0 (x + 6)(x - 1) = 0 x = -6 or x = 1