Which of the following is the polynomial equation 2a⁴ - 5a³ + 9a² - 4 = 0?

Question: Which of the following is the polynomial equation 2a⁴ - 5a³ + 9a² - 4 = 0?

Solution:
The given polynomial equation is in terms of a.
The highest power of a is 4 and hence the degree of the equation is 4.
Hence, it is a biquadratic equation.

The highest degree of the polynomial is 2 is a quadratic equation.
The highest degree of the polynomial is 1 is a linear equation.
The highest degree of the polynomial is 3 is a cubic equation.