Question

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

Answer 1

Answer:

Given -2x + 7x + 8, the correct expression is 5x + 8.

Step-by-step explanation:

The student didn´t notice that 8 was not follow by x, and try to apply common factor. But we can´t do that. The correct form to solve this expression is -2x + 7x + 8 = (-2 + 7)x + 8 = 5x +8.