Answer: f(2)=-5
Explanation:
To solve an equation like this means we need to understand input and output.
Typically, in an equation, x is the input and f(x)/y is the output. To find the output, you need to substitute the input into the equation.
f(x)=x²-9 is our given equation, and we need to find f(2), meaning 2 is x. So we can substitute to into the equation:
f(x)=(2)²-9 is our equation. In GEMDAS or order of operations, Exponents come before subtraction and 2² is 2·2=4. Now our equation is f(x)=4-9. 4-9=-5, meaning f(2) is -5.
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