Answer:
Fernando incorrectly found the product of –2 and –5. 
Step-by-step explanation:
Fernando evaluated the numerator of the fraction incorrectly. 
Fernando simplified StartFraction 20 over 2 EndFraction incorrectly. 
Fernando incorrectly found the product of –2 and –5. 
Fernando evaluated (negative 3) squared incorrectly.
Fernando's calculation
5(9-5) / 2 + (-2)(-5) + (-3)^2
= 5(4) / 2 - 10 + 9
= 20/2 - 10 + 9
= 10 - 10 + 9
= 9
Correct calculation
5(9-5) / 2 + (-2)(-5) + (-3)^2
= 5(4) / 2 + (10) + 9
= 20/2 + 10 + 9
= 10 + 10 + 9
= 29
Therefore, 
Fernando's error was multiplying (-2)(-5) to be equal to -10 instead of 10
Fernando incorrectly found the product of –2 and –5.