Question

If `f(x) = sqrt(25-x^2)`, what is the value of `f(3)`?

Answer 1

4 :)

Explanation:

since `f(3) = sqrt(25 - x^2)`,

we subtitute the value of x for 3 since f(3)
`f(3) = sqrt(25 - 3^2)`

then evaluate the terms inside the radical sign (square root)
`f(3) = sqrt(25 - 9)`
`f(3) = sqrt(16)`

then finalize the answer, since `4*4 = 16`, the square root of `16` is 4, hence the answer is:
`f(3) = 4`