Ax^2 + bx + c = 0
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The form of the quadratic is ax2+bx+c, so the discriminant is b2-4ac.
You know an equation is quadratic by looking at the degree of the highest power in the equation. If it is 2, then it is quadratic. so any equation or polynomial of the form: ax2 +bx+c=0 where a is NOT 0 and a, b and c are known as the quadratic coefficients is a quadratic equation.
You convert the equation to the form: ax2 + bx + c = 0, replace the numeric values (a, b, c) in the quadratic formula, and calculate.
Without an equality sign and no square variable the given terms can not be that of a quadratic equation.
ax2 + bx + c = 0