Final answer:
In a quadratic equation ax^2 + bx + c = 0, the coefficient of x that should not be equal to zero is a.
Step-by-step explanation:
In the quadratic equation ax^2 + bx + c = 0, the coefficient of x that should not be equal to zero is a.
This is because the coefficient a determines the shape of the quadratic curve. If a is equal to zero, the equation becomes a linear equation, not a quadratic equation.
For example, if we have the equation 0x^2 + bx + c = 0, it simplifies to bx + c = 0, which is a linear equation.