Simplifying algebraic expressions

What is the simplified form of this expression 3x + 4 + 5x + 3

• 15x
• 8x+7
• 7x+8

x² + 2 − 1 + 6x² − 4x²

• x ²  -1
• x² +1
• 3x² +1
• x ²+3

Simplify by combining like terms:
4x² - 3x + 11 -2x

• 4x² - 5x + 11
• 11x + 11
• 16x² - 5x + 11
• 10x²

Simplify 4x + 8 + 2x - 7.

• 6x + 15

• 6x - 1

• 6x + 1

• 2x + 1

Simplify the expression: 3x + 2x

• 5x
• x
• 6x
• 5

3x - 5x

• 2x
• 8x
• -2x
• 15x²

Simplify: 3x - 5x + 4 + (-2x)

*don't type any spaces in your answer, example x+1

Simplify: -3x + 5x + 4 +(-1) + (-2x)

*don't type any spaces in your answer, example x+1