Class 10

Math

All topics

Quadratic Equations

Which of the following is a quadratic equation?

- $(a−1)x_{3}+(b−2)x_{2}+c$
- $(a−1)x_{2}+(b−2)x+5c$
- $(a−1)x_{4}+(b−2)x_{2}+2c$
- $(x−1)x_{4}+(b−2)x_{2}+2c$

Here, the only equation that has a second degree variable is $(a−1)x_{2}+(b−2)x+5c$ and all other equations have third and fourth degree variables.

So, the quadratic equation is $(a−1)x_{2}+(b−2)x+5c$.