Solve the Expression: Evaluating 5x-6 When x=8

Question

What will be the result of this algebraic expression:

$5x-6$

if we place

$x=8$

00:07 First, substitute and solve.

00:10 Let's put in the right values from the data we have, and solve the problem step by step.

00:16 Remember, always do multiplication and division before adding and subtracting.

00:22 Now, let's keep solving using the correct order of operations.

00:26 And that's how we find the solution to the problem.

To answer the question we first need to understand what X is.

X is an unknown, meaning it's a symbol that represents another number, an unknown one, that could be there in its place.

Usually in exercises we'll need to calculate and discover what X is appropriate for each exercise,

but in this case the result is given to us: X=8
Therefore, we can substitute (plug in) the value 8 everywhere X appears in the exercise.

So we get:

5*8-6

40-6
34