x=(-b+sqrt(b^2-4*a*c))/(2a) and (-b-sqrt(b^2-4*a*c))/(2a) (This is called the quadratic formula)
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A discriminant that is less than zero.
It is the general form of a quadratic equation.
The equation ax2 + bx + c = 0, where a != 0 is called quadratic.
ax2 + bx +c is an expression, not an equation. It cannot, therefore, have a solution. If the question concerns the equation ax2 + bx + c = 0 then the answer is ax2 - 16ax + 64a = 0 for any a other than 0.
x^2+4x+7