Part A:
In Step 4, your friend's error was in multiplying 110 by 5 instead of adding 110 to 2 times 5. The correct operation should have been addition (+) instead of multiplication (⋅).
Part B:
Original Problem: 3(15−9)2 + 2 ⋅ 5
Step 1: 3(6)2 + 2 ⋅ 5
Step 2: 3(36) + 2 ⋅ 5
Step 3: 108 + 10
Step 4: 118
Your friend asks you to check their work. You see the expression 3(15−9)2 + 2 ⋅5
simplified in the following way:
Original Problem: 3(15−9)2 + 2 ⋅ 5
Step 1: 3(6)2 + 2 ⋅5
Step 2: 3(36)+ 2 ⋅ 5
Step 3: 108 + 2 ⋅ 5
Step 4: 110 ⋅ 5
Step 5: 550
Part A: Explain, using complete sentences, in which step and what specifically your friend's error was.
Part B: Correctly simplify this expression using a similar format - showing work for each step like was done above. Full credit will only be given if work shows Step 1, Step 2, Step 3, etc. as seen above.
1 answer