Question

How do you find the value of \[f\left( 3 \right)\] if \[f\left( x \right) = 3x - 4\]?

Answer 1

Hint: In the given question, we have been given a function. The function has a variable as an argument and the function is equal to a monomial that contains the variable. We have to solve for a given value of the function. To solve that, we are going to put in the value of the given constant, perform the operations, simplify the value, and get the required answer.

Complete step by step answer:
The given function is,
\[f\left( x \right) = 3x - 4\]
We have to evaluate the value of \[f\left( 3 \right)\], so we put in \[x = 3\] in the function’s equation, and we have,
\[f\left( 3 \right) = 3 \times 3 - 4 = 9 - 4 = 5\]

Hence, \[f\left( 3 \right) = 5\].

Note: In the given question, we were given a function whose value was to be evaluated at a given constant. To solve that, we had put in the value of the given constant, performed the operations, simplified the value, and got the required answer. So, it is really important that we know the formulae and where, when, and how to use them so that we can get the correct result.