Evaluate the expression for n = -8: 3 - 2n =
Understand the Problem
The question is asking to evaluate the mathematical expression 3 - 2n when n is given as -8. To solve this, we will substitute -8 for n and perform the arithmetic operations.
Answer
The evaluated expression is $19$.
Answer for screen readers
The evaluated expression is $19$.
Steps to Solve
- Substituting the value of n
Substitute $n = -8$ into the expression $3 - 2n$:
$$ 3 - 2(-8) $$
- Calculating the product
Calculate the multiplication first:
$$ 2(-8) = -16 $$
- Simplifying the expression
Now substitute this back into the expression:
$$ 3 - (-16) $$
- Performing the subtraction
Since subtracting a negative number is equivalent to addition, we have:
$$ 3 + 16 $$
- Final calculation
Now, adding:
$$ 3 + 16 = 19 $$
The evaluated expression is $19$.
More Information
When substituting negative values into expressions, the arithmetic rules still apply, and it's important to remember that subtracting a negative is the same as adding.
Tips
- Confusing the operations by forgetting to change the signs when dealing with negative numbers.
- Neglecting the order of operations, especially in expressions with multiple operations.
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