What will be the result of this algebraic expression:
if we place
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What will be the result of this algebraic expression:
if we place
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
34
What will be the result of this algebraic expression:
\( 5x-6 \)
if we place
\( x=8 \)
Substitution means replacing the variable with its given value. Wherever you see x in the expression, put 8 in its place. So becomes .
This follows the order of operations (PEMDAS)! Multiplication comes before subtraction, so you must calculate first, then subtract: .
It's good practice to use parentheses: instead of . This prevents confusion and makes it clear you're multiplying 5 by 8.
Substitute your answer back! If when x=8, then should equal 34. Calculate: ✓
The process stays the same! If x=3, then . Always substitute first, then calculate using order of operations.
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