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P(WW) = 5/8 x 4/7 = 20/56

P(BB) = 3/8 x 2/7 = 6/56

P(same colour) = 20/56 + 6/56 = 26/56 = 13/28 (simplified)

AB = 4DB

AC = 2DB

Find BC using Pythagoras:

BC = √(4DB)² + (2DB)²

...

Step 1: 7k-21=3k-5

Step 2: 4k=16

Step 3: k=4

3x² +4x-12=0

Step 1: formula (-b+/- square root (b²-4ac))/2a

Step 2: a=3 b=4 c=-12

Step 3: type into your calculator 

Step ...

The easiest method to expand brackets would be to remember FOIL!
F - First
O - Outside
I - Inside
L - Last

Okay, so lets say you want to expand (3x+1)(2x+3), we'll...