Polynomials

What is the leading coefficient of the following polynomial?
5x²-3x+6

• 2
• -3
• 5
• 6

Add the following polynomials:
(x³-2x²+3)+(2x³+3x²-1)

• 3x³-2x²+3x+2
• 3x³+x²+2
• 3x³-5x²-2
• 3x³-x²+1

Add the following polynomials
(x³-6x²+3)+(3x³+4x-1)

• 4x³-2x²+2
• 4x³-6x²+4x+2
• -2x³+2x+2
• 4x³-2x²-2

Subtract the following polynomials:
(3x²-3x+2)-(x²-2x+1)

• 2x²+x+1
• 2x²-5x+3
• 2x²-x+1
• 4x²-5x+3

Subtract the following polynomials:
(2x³+6x²+4x-2)-(x³+4x²-x)

• x³+2x²+5x-2
• x³+10x²+3x-2
• 3x³+2x+4x-3
• 3x³+10x²-3x-2

Multiply
(4x+3)(2x-1)

• 8x²-2x-3
• 8x-3
• 8x²+6x-3
• 8x²+2x-3

(x-3)(x²+2x+7)

• x³-x²+x-21
• x³+5x+13x-21
• x³-3x²+7x-21
• x²+2x-3

Combine like terms to simplify:
 (5x + 2) + (4x + 5)

• 9x -7
• -9x-11
• 9x+7
• x+7

(4x²+ x) - (x²+ 2x)

• 3x² - x

• 4x² + 2x

• 3x² + 3x

• 3x² + 2x

(3x² + 4x - 2) - (5x + 7)

• 3x² - x - 9
• 2x² - 9
• 3x² + 9x - 5
• 3x² - x + 5