For the polynomial x⁵ - x⁴ + x³ - 8x² + 6x + 15, the maximum number of linear factors is :

1. 9

2. 6

3. 7

4. 5

If f(x) = 3x + 8; the value of f(x) + f(-x) is :

1. 8

2. 16

3. -8

4. -16

Factors of 3x³ - 2x² - 8x are :

1. x(3x² - 2x - 8)

2. x(x - 2)(3x + 4)

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

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

Factors of 4 + 4x - x² - x³ are :

1. (2 + x)(2 - x)(1 + x)

2. (x - 2)(1 + x)(2 + x)

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

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