Question

All the questions are similar but I need help

2. Explain and correct the error made by a student who simplified this expression.
–2x + 7x + 8
(–2 + 7 + 8)x
13x

3. Explain and correct the error made by a student who simplified this expression.
–2 + 7(x + 8)
5(x + 8)
5x + 40

4. Explain and correct the error made by a student who simplified this expression.
–2x – 4x + 8y – y
(–2 – 4)x + (8 – 0)y
–6x + 8y

Answer 1

Explanation:

2) They distributed an x out of the term with out one. that is the 8

so the expression should be 5x +8

3) They didn't follow order of operations and took 2 away from the 7 before they distributed the 7 :O very bad of them

the expression should be 7x + 54

4) They distributed out the y but didn't leave a 1 so the problem lost a term.

the expression should be -6x + 7y