Question

how to know that its quadratic equation or not

Answer 1

Answer:

(For example: no x3 x 3 terms, no variables inside square roots, no variables in denominators, and so on.) So, sweep across the equation and look for anything other than x x terms and constant terms. If you find any, then it's not a quadratic equation.

Answer 2

Answer:

ಥ‿ಥ(╥﹏╥)

Step-by-step explanation:

For example: no x3 x 3 terms, no variables inside square roots, no variables in denominators, and so on.) So, sweep across the equation and look for anything other than x x terms and constant terms. If you find any, then it's not a quadratic equation.