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Use a table of values to graph the following functions. State the domain and range.

y=x2+2x+5

Short Answer

Expert verified

The graph of the function is:

The domain is all real numbers and the range is {y|y≥4}.

Step by step solution

01

Step 1. Define the concept.

The domain of a function is the complete set of possible values of the independent variable. The domain is the set of all possible x-values that will make the function "work" and will output real y-values.

Therangeof a function is the complete set of all possibleresulting valuesof the dependent variable (y,usually) after we have substituted the domain.

02

Step 2. Make a table to calculate points on the graph. 

For the equation,y=x2+2x+5,make a table to get some points on the graph.

x

y=x2+2x+5

(x,y)

0

y=02+2(0)+5=5

(0,5)

role="math" localid="1648204417494" -2

y=(−2)2+2(−2)+5=5

(−2,5)

-5

y=(−5)2+2(−5)+5=20

(−5,20)

1

y=(1)2+2(1)+5=8

(1,8)

3

y=(3)2+2(3)+5=20

(3,20)

Graph the ordered pairs, and connect them to create a smooth curve. The parabola extends to infinity.

03

Step 3. Graph the equation and write domain and range.

Graph the ordered pairs, and connect them to create a smooth curve. The parabola extends to infinity.

The domain is all real numbers. The range is all real numbers greater than or equal to the minimum value or y|y≥4.

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