Raul tried to evaluate an expression step by step.
=
=
=
3−(−5)−7
3+5−7
3+2
5
Step 1
Step 2
Step 3
3−(−5)−7
3 + 5 -7 = 8 - 7 or 3 -2 = 1
3+5−7
3+(-2)
or, using the usual left-to-right ordering,
3+5−7
8-7
To evaluate the expression step by step, Raul followed the following steps:
Step 1: He started with the expression 3 - (-5) - 7. In mathematics, when subtracting a negative number, it is equivalent to adding its opposite. So, 3 - (-5) is the same as 3 + 5. Therefore, his first step was to change the subtraction to addition, resulting in 3 + 5 - 7.
Step 2: In the next step, Raul performed the addition part of the expression. He added 3 and 5, which resulted in 8. So, his second step was to evaluate 3 + 5 - 7 as 8 - 7.
Step 3: Raul simplified the final expression by subtracting 7 from 8. 8 - 7 equals 1. Therefore, his third step was to evaluate 8 - 7 as 1.
After following these steps, Raul found that the expression 3 - (-5) - 7 evaluates to 1.