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if f (x) = 4x what is f (5)

Sagot :

Answer:

f(x) = 4x. f(5) = 4(5) = 20.

Step-by-step explanation:

Answer:

f(5) = 20

Step-by-step explanation:

If you have a function f(x) as you do here, to find the value of f(a) or any value that is inside of the f, substitute that value for all values of x in that equation.

Example:

f(x) = x²

f(a) = a²

For your problem with function

f(x) = 4x,

to find f(5), put 5 in for all values of x in the function.

f(5) = 4(5)

f(5) = 20.