Question

Question 2: Look at the students work and solution to the problem. Identify the error that is made and describe it. Solve the problem correctly. Incorrect work/solution Simplify the expression: 7k + 14 - 9k - 10 = 16k + 4 Identify and Explain the error

Answer 1

-2k + 4

Explanation:

Given:

Incorrect work / solution

7k + 14 - 9k - 10 = 16k + 4

Error is the simplification of the like terms, that is, 7k - 9k

Correct work / solution

7k + 14 - 9k - 10

Collect like terms

= 7k - 9k + 14 - 10

= -2k + 4

The error made was adding 7k and 9k together, instead of subtracting 9k from 7k which gives -2k as answer