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**Sketch the function:????**

Hello everyone, I was asked the following question:

On the same axes, sketch the functions:

f(x) = 10+3x-x^2

g(x) = 3x^2-6x-5

Calculate the coordinates of the two points where the two lines cross. How far apart are the two points:

I don't even know how to start?

Am I supposed to use the quadratic formula and first sketch f(x) and then use the quadratic formula again to sketch g(x) on the same graph??

Please help.......