Is 3m+8=15 is quadratic?

The Quadratic equation is defined as a polynomial whose highest degree is 2.
The general form of Quadratic equation is ${\displaystyle a{x}^2+bx+c=0(a\ne 0)}$, where x is the unknown variable, a, b and c are the constants.
Examples:
${\displaystyle x^2-4x+2=0}$
${\displaystyle t^2+5=0}$
The given equation is 3m+8=15.
Here, the variable is m. The highest degree of the equation is 1.
But, it is known that the highest degree of a quadratic equation must be 2.
Therefore, he given equation is not quadratic.