Question

What is the vertex of the graph of y = – |4x + 8| + 3?

(–2, 3)

(2, –3)

(2, 11)

(–2, 5)

Answer 1

http://wolframalpha.com I like to cheat it cheat it

Answer 2

parth no -_-

Answer 3

I need to learn.........cheating gonna make me lazy

Answer 4

Well... the only thing I do here is to use Calculus to find our absolute extrema. Do you want to do that?

Answer 5

omg big words :O..........sure

Answer 6

Do you know about differentiation?

Answer 7

nope

Answer 8

Then you should cheat. And by the way, it is stupid to not use technology when it is there.

Answer 9

I'm actually not sure you can use Calculus here. Let me leave it to the experts.

Answer 10

equations with absolute values (the | | ) have a vertex where the stuff inside the | | is zero.
so find x so that 4x+8 =0

of course the y value is just 3 at this point

Answer 11

At x=-2 the absolute part is zero; so that is the vertex (-2,3)

Answer 12

thank you

Answer 13

thanks for showing your work

Answer 14

If you knew the vertex happens when the absolute zero part is 0, they you would see
y = -|0| +3 which is just 3
that is y=3
looking at your choices, only 1 pair has 3 for its y-value.

Answer 15

If more than 1 pair had 3 for the y value, you would have to find the x value to get the correct pair. that is when you have to solve 4x+8=0 to find 4x= -8 and x= -8/4= -2