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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...

This is a common question as we are often taught to differentiate by simply being told how to do the calculation, but not what it is we're really doing.
The concept
Diffe...