It is a quadratic function which represents a parabola.
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A discriminant that is less than zero.
It is the general form of a quadratic equation.
A quadratic equation.
x^2+4x+7
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.