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Precaculus Week 4 Assignment

 
 
Picture of Colin Chen
Precaculus Week 4 Assignment
by Colin Chen - Monday, 10 October 2016, 4:05 PM
 

Hi, 

I have a few questions on the homework for week 4. Can someone please help?

They are: 

1-6 Q62,65,66

Thank you 

 
Picture of David Reynoso
Re: Precaculus Week 4 Assignment
by David Reynoso - Tuesday, 11 October 2016, 4:56 PM
 

Hey Colin,

For those questions you will need to use the graphs of the functions to find the values that you need. You just need to be careful with the order in which you plug in the numbers in the functions. For example, if the question was $\left(f\circ g\right)\left(2\right)$ you would need to find first $g(2)$ and use that to plug into $f$:

$\left(f \circ g \right) \left( 2 \right) = f \left( g \left(  2 \right) \right) = f \left( -2 \right) = -4$

Something similar happens when you add or subtract functions, in that case you just need to plug in the value into each function and then add or subtract accordingly. For example, if we wanted $\left( g-f\right) \left(2\right)$, we would need to first find $g\left( 2\right)$ and $f\left(2\right)$, and then subtract:

$\left( g-f\right) \left(2\right) = g\left( 2 \right) - f \left( 2 \right) = -1 - 2 = -3$

Cheers,

David