So, the correct equation is equivalent to the x + 9 = ±5. The third option is correct.
What is the quadratic equation?
It is a polynomial that is equal to zero. Polynomial of variable power 2, 1, and 0 terms are there. Any equation having one term in which the power of the variable is a maximum of 2 then it is called a quadratic equation. The general form of the quadratic equation is ax² + bx + c.
Given
(x + 9)² = 25 is a quadratic equation.
How to find the equation results from taking the square root of both sides?
(x + 9)² = 25 is a quadratic equation.
Taking square root on both sides.
(x + 9) = √25
(x + 9) = ±5
So, the equation is equivalent to the x + 9 = ±5.
Thus, the third option is correct.