- #1
skyza
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- 0
Can anyone help me graph this function? I don't think we took notes on this in class.
f(x)={
7x+7
if x ≤ 0
x
if 0 < x ≤ 2
4
if x ≥ 2
Thank you
f(x)={
7x+7
if x ≤ 0
x
if 0 < x ≤ 2
4
if x ≥ 2
Thank you
failexam said:Draw the x and y axes, first of all.
For x ≤ 0, find f(-1) and f(-2) and draw a line that passes through (-1, f(-1)) and (-2, f(-2)) s.t. the line extends throughout x ≤ 0.
For 0 < x ≤ 2, find f(1) and f(2) and draw a line that passes through (1, f(1)) and (2, f(2)) s.t. the line extends throughout 0 < x ≤ 2.
For x > 2, f(x) = 4. In other words, no matter what the value of x, y is always 4. Therefore, draw a horizontal line s.t. y is 4.
Is 1 less than or equal to 0? That is a yes or no question -- not an either this or that question.skyza said:Thanks for the help.
I have one other quick question.
Would the requested value for this problem be 14?
f(1) for
f(x) = {
7x+7
if x ≤ 0
3-2x^2
if 0 < x ≤ 2
4
if x ≥ 2
RoshanBBQ said:Is 1 less than or equal to 0? That is a yes or no question -- not an either this or that question.
skyza said:Yes. So the answer is 1, right?
RoshanBBQ said:Is it your opinion that 1 is less than 0 or equal to 0? This one is an either or question.
skyza said:Sorry, it's late. I read that wrong. 1 is greater than 0.
RoshanBBQ said:It's not a problem. I am trying to work with you to think through the problems. If 1 is greater than 0, it is not less than or equal to 0. Which functional relationship should you use then?
skyza said:0 < x ≤ 2
RoshanBBQ said:That isn't the functional relationship between y and x. We wouldn't say y = f(x) = 0 < x ≤ 2. That is the condition that brings about from which functional relationship we choose. So you did choose the right condition. The functional relationship is right beside it: 3-2x^2.
That is, between 0 < x ≤ 2, we say y = 3-2x^2.
skyza said:So how would I find out the answer?
roshanbbq said:you want to know what the function, f(x) outputs at x = 1. For 0 < x ≤ 2, we say the function outputs 3-2x^2. You have confirmed that 1 is between 0 and 2. Do you know how to use this functional relationship to output the answer? Hint: x is just a placeholder in 3-2x^2. What should you put there?
You have the right idea, but you messed up in the maneuver. Think about what a squaring of a number does: It is a shorthand way to say "Let's do some multiplication." When you haveskyza said:3-2(1)^2 = -1
RoshanBBQ said:You have the right idea, but you messed up in the maneuver. Think about what a squaring of a number does: It is a shorthand way to say "Let's do some multiplication." When you have
[tex] 1^2 [/tex]
you are saying "Let's multiply two 1s together. For example, if you had
[tex] 3^3[/tex]
You would be saying, "Let's multiply three 3s together. So
[tex]3^3 = (3)(3)(3) = (9)(3) = 27[/tex]
Another example would be if I had
[tex] 2^4[/tex]
That is saying "Let's multiply four 2s together.
[tex] (2)(2)(2)(2) = (4)(2)(2)=(8)(2) = 16[/tex]
What is 1 multiplied together two times?
skyza said:it's 1
RoshanBBQ said:So what is 3 - (2)(1)?
skyza said:1. Is 1 the answer?
RoshanBBQ said:Yes.
skyza said:Thanks for the help.
I've finished all of my homework except ONE question.
What is the range of this question:
f(x) = √(x-1) +1
I know it's not (-∞, ∞)
Is it [1, ∞)?
RoshanBBQ said:Yes.
skyza said:I really appreciate all the help. I'm going to school to become a mechanical engineer, so I'm sure I'll be back with more questions.
To graph a function, you will need to first determine the independent and dependent variables. Then, plot points on a coordinate plane using the values of the variables and connect them to create a line or curve.
Graphing a function helps to visualize the relationship between the independent and dependent variables. It also allows for easier analysis and interpretation of the function's behavior.
There are several types of functions that can be graphed, including linear, quadratic, exponential, logarithmic, trigonometric, and polynomial functions.
The domain of a function is the set of all possible input values, while the range is the set of all possible output values. To find the domain, you would need to look at any restrictions on the independent variable, and for the range, you would need to determine the minimum and maximum values of the function.
Yes, there are many online tools and software programs that can assist in graphing a function. These tools can also help with analyzing the function and identifying key features such as intercepts, asymptotes, and extrema.