Evaluation Math Example 3

Follow the full solution, then compare it with the other examples linked below.

Example 3

easy
Evaluate −2x+10-2x + 10 when x=−3x = -3.

Solution

  1. 1
    Substitute: −2(−3)+10=6+10=16-2(-3) + 10 = 6 + 10 = 16.
  2. 2
    Be careful with the double negative: −2×−3=+6-2 \times -3 = +6.

Answer

1616
When substituting a negative value, use parentheses to avoid sign errors. Multiplying two negatives gives a positive.

About Evaluation

The process of calculating the numerical value of a mathematical expression by substituting specific numbers for each variable and then performing the indicated operations following the order of operations (PEMDAS/BODMAS).

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More Evaluation Examples

Example 1 easy

Evaluate [formula] when [formula].

Example 2 medium

Evaluate [formula] when [formula] and [formula].

Example 4 hard

If [formula], find [formula].

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