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akch2002
akch2002, M.Tech.
Category: Pre-Calculus
Satisfied Customers: 7307
Experience:  Maths expert
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How do I graph (f+g)(x)? f(x) = 2x^2 + 5x - 6 g(x) = x^2 -

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Hello,How do I graph (f+g)(x)?f(x) = 2x^2 + 5x - 6
g(x) = x^2 - 2x + 4

We will have (f+g)(x)=3x^2+3x-2 and we plot it as given in the following fig.

fig

kindly let me know if there is any doubt.

Customer: replied 1 year ago.
Hello,
Am I able to find f(-1) and g(-1) seperately, then add the two points together?
So it's (f+g)(x). Instead of adding the two functions and making a single quadratic function. Could I insert (-1) into (f)x and then (-1) into g(x) so that I find a point for both of them seperately, then add the two points together?
Customer: replied 1 year ago.
I.e.) If i put it into a table where my headers are X l f(x) l g(x) l (f+g)(x).
So I plug in -1 to X, then find f(x) and g(x). Which should then equal (f+g)(x) if I add them together?

yes, it can also be done.

Customer: replied 1 year ago.
Okay so what am I doing wrong?
Customer: replied 1 year ago.
Okay so what am I doing wrong?
When I plug (-1) into both f(x) and g(x) it doesn't give me -2 which is what you've got for (-1,-2)

you will have to f(x) and g(x) algebraically. Don' t put absolute values

you will have to add f(x) and g(x) algebraically. Don' t put absolute values

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