Question

Cara evaluated the expression below.

StartFraction 4 (7 minus 13) over 3 EndFraction + (negative 4) squared minus 2 (6 minus 2) = StartFraction 28 minus 13 over 3 EndFraction + (negative 4) squared minus 2 (4) = StartFraction 15 over 3 EndFraction + 16 minus 18 = 5 + 16 minus 8 = 13.



What was Cara’s error?


Cara multiplied only 4 and 7 together and did not multiply 4 and 13.


Cara evaluated (Negative 4) squared incorrectly.


Cara subtracted 2 from 6 incorrectly.


Cara multiplied 2 and 4 incorrectly.

Answer 1

Cara multiplied only 4 and 7 together and did not multiply 4 and 13.

Explanation:

She didn't distribute the 4 to both numbers inside the parenthesis. If she had done so, she would have gotten 28 - 42, not 28 - 13.