If x² - 3x + 2 = 0, values of x correct to one decimal place are :

1. 2.0 and 1.0

2. 2.0 or 1.0

3. 3.0 and 2.0

4. 3.0 or 2.0

If x² - 4x - 5 = 0, values of x correct to two decimal places are :

1. 5.00 or -1.00

2. 5 or 1

3. 5.0 and -1.0

4. -5.00 and -1.00

If x² - 2x - 3 = 0; values of x correct to two significant figures are :

1. 3.0 and 1.0

2. -1.0 and 3.0

3. 3.0 or -1.0

4. 3.00 or -1.00

The value (values) of x satisfying the equation x² - 6x - 16 = 0 is/are :

1. 8 or -2

2. -8 or 2

3. 8 and -2

4. -8 or 2