Understanding perpendicular and parallel lines are extremely important, especially in the engineering field when building infrastructures or houses because they need to calculate how they will keep a building stable. For example, bridges we see have a lot of perpendicular and parallel lines, that's because without those the bridge can't hold itself up, it needs support from the metals that are parallel and perpendicular.
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The set of real numbers is all numbers that can be shown on a number line. It also includes rational numbers, which are numbers that can be written as a ratio of two integers, and irrational numbers, which cannot be written as a the ratio of two integers.
Answer:
The simplified form of given expression
is 
Step-by-step explanation:
Given: Expression 
We have to write the given expression in simplified form,
Consider the given expression 
Divide the numbers 
we get,

Apply exponent rule , 

we get,

Cancel y term, we have,

Thus, The simplified form of given expression
is 
Solving
by completing a square gives 
Step-by-step explanation:
We need to solve the equation
by completing a square
The completing a square method requires: 
Solving:

We need to add and subtract (4)^2=16 to make the equation a complete square

So, Solving
by completing a square gives 
Keywords: Solve by completing a square
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-2n -(n+4)
-2n+ -n+ -4
-3n+ -4
The answer is -3n-4.
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