Simplifying Linear Expressions

Simplify the expression:

simplifica la expresión:

4 + 2(x - 2) - 4

• 4x - 4

• 2x

• 2x + 4

• 2x - 4

Describe the mistake in this problem. The student was simplifying the expression. What went wrong?

2x + 3 + 4x

Student answer: 9x

Describe the student's mistake in your own words.

Describe el error en este problema. El alumno estaba simplificando la expresión. ¿Qué falló?

2x + 3 + 4x

Respuesta del alumno: 9x

Describe el error del alumno con tus propias palabras.

2(2x + 1) =

• 4x + 1

• 2x + 2

• 5x

• 4x + 2

- (2x - 1) =

• - 2x - 1

• 2x + 1

• - 2x + 1

• 2x - 1

2(x + 3) + 4 =

• 2x + 6 + 4

• 2x + 6

• 2x + 10

7 - 2(3 + 4x) =

• 15 + 20x

• 1 - 8x

• 1 + 8x

3(x + 1) - 2x =

• x + 3

• 5x + 3

• x + 1

- 3 - 6(2x - 1) =

• - 18x + 9

• 3 - 12x

• - 9 - 12x

2(x - 1) + 3(x + 1) =

• 5x + 5

• x + 1

• 5x + 1

4(- x + 1) - 2(x + 1) =

• 2x + 2

• - 6x + 2

• - 6x + 6