Question

Explain and correct the error made by a student who simplified this expression.

Answer 1

Answer:

5x + 8

Step-by-step explanation:

- 2x + 7x + 8

the student has added the numerical values of the 3 terms even though they are not all like terms

correction

- 2x + 7x + 8 ← collect like terms

(- 2x + 7x) + 8

= 5x + 8

Answer 2

Hello,

That is (+8) and not (+8x) at the end

Correct the error :

$- 2x + 7x + 8$

$= x( - 2 + 7) + 8$

$= 5 \times x + 8$

$= 5x + 8$