SOLUTION: How do you put 2n^2-4n-6=0 in to a graph or table . Round to the nearst tenth

Question 117549: How do you put 2n^2-4n-6=0 in to a graph or table . Round to the nearst tenth
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
In order to make a table, just plug in some n values. So I'm going to start at n=-5

Let's evaluate

Start with the given function.

Plug in . In other words, replace each n with -5.

Evaluate to get 25.

Multiply 2 and 25 to get 50

Multiply -4 and -5 to get 20

Now combine like terms

-----------Now let's evaluate another value---------

Let's evaluate

Start with the given function.

Plug in . In other words, replace each n with -4.

Evaluate to get 16.

Multiply 2 and 16 to get 32

Multiply -4 and -4 to get 16

Now combine like terms

-----------Now let's evaluate another value---------

Let's evaluate

Start with the given function.

Plug in . In other words, replace each n with -3.

Evaluate to get 9.

Multiply 2 and 9 to get 18

Multiply -4 and -3 to get 12

Now combine like terms

-----------Now let's evaluate another value---------

Let's evaluate

Start with the given function.

Plug in . In other words, replace each n with -2.

Evaluate to get 4.

Multiply 2 and 4 to get 8

Multiply -4 and -2 to get 8

Now combine like terms

-----------Now let's evaluate another value---------

Let's evaluate

Start with the given function.

Plug in . In other words, replace each n with -1.

Evaluate to get 1.

Multiply 2 and 1 to get 2

Multiply -4 and -1 to get 4

Now combine like terms

-----------Now let's evaluate another value---------

Let's evaluate

Start with the given function.

Plug in . In other words, replace each n with 0.

Evaluate to get 0.

Multiply 2 and 0 to get 0

Multiply -4 and 0 to get 0

Now combine like terms

-----------Now let's evaluate another value---------

Let's evaluate

Start with the given function.

Plug in . In other words, replace each n with 1.

Evaluate to get 1.

Multiply 2 and 1 to get 2

Multiply -4 and 1 to get -4

Now combine like terms

-----------Now let's evaluate another value---------

Let's evaluate

Start with the given function.

Plug in . In other words, replace each n with 2.

Evaluate to get 4.

Multiply 2 and 4 to get 8

Multiply -4 and 2 to get -8

Now combine like terms

-----------Now let's evaluate another value---------

Let's evaluate

Start with the given function.

Plug in . In other words, replace each n with 3.

Evaluate to get 9.

Multiply 2 and 9 to get 18

Multiply -4 and 3 to get -12

Now combine like terms

-----------Now let's evaluate another value---------

Let's evaluate

Start with the given function.

Plug in . In other words, replace each n with 4.

Evaluate to get 16.

Multiply 2 and 16 to get 32

Multiply -4 and 4 to get -16

Now combine like terms

-----------Now let's evaluate another value---------

Let's evaluate

Start with the given function.

Plug in . In other words, replace each n with 5.

Evaluate to get 25.

Multiply 2 and 25 to get 50

Multiply -4 and 5 to get -20

Now combine like terms

Now lets make a table of the values we have calculated

Now plot the points

Now connect the points to graph (just replace n with x) (note: the more points you plot, the easier it is to draw the graph)

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