Question

help me please! x.x

Answer 1

you can deduce the function of that graph by looking at certain features of the graph.
what is the amplitude of the graph?

Answer 2

the amplitude is 4 @perl

Answer 3

yeap

Answer 4

so.... notice the graph hits the y-axis at -4
and has a minimum there.... so....

if we move over the see the left-side, to see where it hits the x-axis on the left
it'd end up at \(-\frac{\pi}{2}\) anyhow, that means, the graph is either shift to the left or right by that much

Answer 5

so keep in mind that that \(\large \textit{function transformations}
\\ \quad \\

\begin{array}{llll}

\begin{array}{llll} shrink\ or\\ expand\\ by\ {\color{purple}{ A}}\end{array}
\qquad
\begin{array}{llll} vertical\\ shift\\ by \ {\color{green}{ D}} \end{array}

\begin{array}{llll}{\color{green}{ D}} > 0& Upwards\\ {\color{green}{ D}} < 0 & Downwards\end{array}
\\

% template start
\qquad \downarrow\qquad\qquad\quad\ \downarrow\\
y = {\color{purple}{ A}} cos( x + {\color{red}{ C}} ) + {\color{green}{ D}}\\
%template end
\qquad\qquad \quad \uparrow \\

\qquad\begin{array}{llll} horizontal\\ shift\\ by \ {\color{red}{ C}}\end{array}

\begin{array}{llll}{\color{red}{ C}} > 0 & to\ the\ left\\ {\color{red}{ C}} < 0& to\ the\ right\end{array}
\end{array}\)

so... you can see what the shift is

Answer 6

B! :D

Answer 7

well

Answer 8

recall the cos(x) graph? recall where it hits the y-axis?

Answer 9

I get confused between cos and sin ):

Answer 10

http://fooplot.com/#W3sidHlwZSI6MCwiZXEiOiI0Y29zKHgpIiwiY29sb3IiOiIjRDkxNDE0In0seyJ0eXBlIjowLCJlcSI6IjRzaW4oeCkiLCJjb2xvciI6IiMxRTFFRDEifSx7InR5cGUiOjEwMDB9XQ-- <--- notice those two

if you shift either, by THAT MUCH, which one would give you the graph?

Answer 11

d? @jdoe0001

Answer 12

well... what do you think about the graphs?

Answer 13

which one shifted would give you the graph?

Answer 14

the red one? @jdoe0001 im sorry, im not so hot in this

Answer 15

well... try it yourself there then
type in x-pi/2 and then press [tab]
see if it does shift that way