PLEASE HELP A GIRL OUT!
Which function has the greatest maximum y-value?

Question

PLEASE HELP A GIRL OUT!
Which function has the greatest maximum y-value?

anonymous · Answer

And where are the functions Girl??

anonymous · Answer

anonymous · Answer

@Abmon98

nincompoop · Answer

maximum would be the highest point

anonymous · Answer

f(x)

nincompoop · Answer

are you sure, @AndreyZn ?
are you just going to give out answers and not justify them mathematically?

anonymous · Answer

I'm sure. I thought @dsdasd will ask me about it, but ok.
f(x) - maximum will be when 3cos2x will be max, it will be max, when cos2x max. max value of cos2x is 1. => 3cos2x+4 maximum is 7.
g(x). from the grafic it's 3
h(x). from the table it's -2
so maximum is 7

abmon98 · Answer

$$y=3\cos(2x)+4 $$
$$-1 \le \cos2x \le 1\rightarrow-3\le3\cos2x \le3\rightarrow 1\le3\cos2x+4\le7$$
$$\max=7 $$$$\min=1 $$

anonymous · Answer

andreyzn is correct, just took the test :)