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Lacey-May Snyder
The Quadratic equation is defined as a polynomial whose highest degree is 2.
The general form of Quadratic equation is $a{x}^{2}+bx+c=0\left(a\ne 0\right)$, where x is the unknown variable, a, b and c are the constants.
Examples:
${x}^{2}-4x+2=0$
${t}^{2}+5=0$
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.