Identify x value: Identify the value of x to substitute into the function.x=−2
Substitute x into function: Substitute x=−2 into the function f(x)=6−x2.f(−2)=6−(−2)2
Simplify denominator: Simplify the denominator by adding 6 and −2.6−(−2)=6+2=8
Calculate function value: Calculate the value of the function with the simplified denominator. f(−2)=82
Reduce fraction: Reduce the fraction to its simplest form. 82=41
Determine function interval: Determine the interval of the function where it is defined.The function is undefined when the denominator is zero, so 6−x=0.x=6The interval of the function is all real numbers except x=6.