Question

If $a{x}^n+b{x}^{(n-1)}-1+c=0$ is a quadratic equation, then $n-1=$ ______.

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is A 1

For the equation to be a quadratic, its degree must be equal to 2.

$n$ is the highest degree of the quadratic equation $a{x}^n+b{x}^{(n-1)}-1+c=0$
$\Rightarrow n=2\Rightarrow n-1=1$