Answer:
Evaluating Functions
To evaluate a function is to:
Replace (substitute) its variable with a given number or expression.
Like in this example:
Example: evaluate the function f(x) = 2x+4 for x=5
Just replace the variable "x" with "5":
f(5) = 2×5 + 4 = 14
Answer: f(5) = 14
More Examples
Here is a function:
f(x) = 1 − x + x2
Important! The "x" is just a place-holder! And "f" is just a name.
These are all the same function:
f(x) = 1 − x + x2
f(q) = 1 − q + q2
w(A) = 1 − A + A2
pumpkin(θ) = 1 − θ + θ2
Evaluate For a Given Value:
Let us evaluate that function for x=3:
f(3) = 1 − 3 + 32 = 1 − 3 + 9 = 7
Evaluate For a Given Expression:
Evaluating can also mean replacing with an expression (such as 3m+1 or v2).
Let us evaluate the function for x=1/r:
f(1/r) = 1 − (1/r) + (1/r)2
Or evaluate the function for x = a−4:
f(a−4) = 1 − (a−4) + (a−4)2
= 1 − a + 4 + a2 − 8a + 16
= 21 − 9a + a2
Step-by-step explanation:
thats all po pa brainlest po>.<
