中四數學第一,二課問題

中四數學幾問...
想知道步驟,點計出黎
已附答案 thx~

1. (2√3i)(4√3i^5) (答案是-24)

2. √-2+√-8 (答案是3√2i)

3. √-27 - √-12 (答案是√3i)

4a. coordinates of A(-6 , 2) B(-2 , -4)

Find the equation of the straight line which joins A and B.

(答案是3x + 2y + 14 = 0)

4b. Given that the coordinates of R and S are (4 , -13) and (-10 , 12) respectively, do R and S lie on the straight line AB? Explain your answer.

(答案是 R: yes S: no)

5. L1: 4x - 3y + 3 = 0 and L2 are two straight line and intersect in Q(a , 5).

Find the equation of the straight line L2 passing through Q and with slope -0.5.

(答案是 x + 2y - 13 = 0)