I have a couple I need help on, if you could show step by step that would be great.

1- Divide:

2x2 + 5x – 12 ÷ 2x2 – 7x + 6
9x2 – 16 3x2 – x – 4

2-Perform the indicated operations

√[50] + 2√[32] – √[8]

3- Multiply:

(5√[2] + 3)(√[2] - 2√[3])

4- Rationalize the denominator:

2____
√[6] - √[5]

Thank s