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Question:
Fernando evaluated the expression below.
What was Fernando's error?
- Fernando evaluated the numerator of the fraction incorrectly.
- Fernando simplified 20/2 incorrectly.
- Fernando incorrectly found the product of –2 and –5.
- Fernando evaluated (-3)² incorrectly.
Answer:
- Fernando incorrectly found the product of –2 and –5.
Explanation:
Given
Required
Spot the error
The error in this evaluation is the product of -2 and -5 at step 2
When a negative number (-2) is multiplied by a negative number (-5), the outcome of the multiplication is always a positive number (10).
So, the result of -2 * -5 is 10 but Fernando incorrectly calculated it as -10.
Solving the expression, correctly
Hence, the actual result of the expression is 29 (not 9 as calculated by Fernando).