Question

If $a{x}^2+bx+c=0$ is a quadratic equation, then $a$ CANNOT be

• A. $-1$
• B. $0$
• C. $1$
• D. $\pi$

Answer 1

The correct option is B

$0$

The standard form of any quadratic equation is $a{x}^2+bx+c=0$, provided $a,b,c$ are real numbers and $a\ne 0$ [$a$ is called the leading coefficient]. If $a=0,$ the equation would become $bx+c=0$ which is then a linear equation, but not a quadratic any more. Hence, the leading coefficient, which is $a,$ should never be $0$ in a quadratic equation.