Skip to main content
vilma1-Visitor
1-Visitor
October 28, 2012
Question

calculating points on a graph

I have a question on the graphing of a function. Lets say my function f(x) is x^2+10x+2.

Now I need to write a graph of the function which is no problem.

a)The second part is to make Mathcad calculate the points where the graph intersects with the x-axis.I can see from the graph what the right answers are but I cannot figure out to how to make Mathcad to calculate them?

b)I need to calculate f(25)?

c)finally, somewhat similar to part a, I need to calculate the intersection point between f(x) and y=2x+1?

Thank you for all the help you can give me!

4 replies

AlanStevens19-Tanzanite
19-Tanzanite
October 28, 2012

See attached.

Alan

Translate
ValeryOchkov24-Ruby IV
24-Ruby IV
October 28, 2012

We can show solutions (roots of the function) on the plot by markers help:

sol.png

Translate
MichaelH1-Visitor
1-Visitor
October 28, 2012

The root() function is handy for this sort of thing.

Be sure to graph the function so you can verify the solution makes sense.


Translate
ValeryOchkov24-Ruby IV
24-Ruby IV
October 28, 2012

MichaelH wrote:

The root() function is handy for this sort of thing.

Be sure to graph the function so you can verify the solution makes sense.


One good rule.

We must at first use symbolic Math (the solve operator for example) for the solving any problem and than if symbolic Math can not solve this problem we must use numerical Math (the function root for example).

Translate
Terms & ConditionsAccessibility statement