book Maths Puzzle Numerical Ability

Simplyfy the complex fraction :

Can you please explain the step by step method:


3- 2/n-4
_________

5+ 4/n-4

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book Other Question
x2 - 3x + 2 = 0
1)Using the quadratic equation x2 - 3x + 2 = 0, perform the following tasks:

a)Solve by factoring.
Answer:
Show work in this space.



b)Solve by com I have to find the perimeter of a rectangle it says use P=2w=2L
my dimensions are in inches and they are 2x for W and 2x+6 for L How do I solve this problem?