x = 1
Step-by-step explanation:
Given data:
Recall: If f(x) = 0, then x is called the zero of the function.
To find zero of the function, take f(x) = 0.
Add 6 to both sides of the equation.
Divide both sides of the equation by 3.
Taking square on both sides of the equation.
⇒ x + 3 = 4
⇒ x = 1
Hence, the zero of the function is 1.