Q3-Which method would best solve the following quadratic?

x^2-81=0

A=Factoring

B=Graphing

C=Square root

D=Completing the square

E=Quadratic formula

Why did you choose the method you chose for question 3?

Square root method is best method to solve the given equation.

Step-by-step explanation:

The given equation x²-81=0 can be best solved by the square root method. The square root method is best applicable when both the terms are perfect squares. In the equation, x²-81=0, all the terms are perfect squares.

After segregation of terms, a simple square root of the equation would yield the desired result.

x²=81

∴ x = ±9

Since the equation is a polynomial of 2 degrees, the equation would have 2 solutions. Hence the value of x can be either + 9 or - 9.