Teach me functions.

Question

Teach me functions.

helpwithfunctions · Answer

I have this question solved, I just want to make sure I can do other functions. Y = -|2x| =3

thecatman · Answer

absolute value

thesmartone · Answer

There are two equal signs?

helpwithfunctions · Answer

That's what the teacher showed, I don't really understand it.

helpwithfunctions · Answer

Wait
no. Don't count the first one. The problem is -|2x| = 3

thesmartone · Answer

Basically

If |x| = a

then x = a, and x = -a

thesmartone · Answer

You would first start by dividing both sides by -1 and then doing what I said above. :)

helpwithfunctions · Answer

And then what? How do I know I have the right answer?

thesmartone · Answer

you can plug it in :)

any negative number inside of | | becomes positive

for example |-5| = 5
all positive numbers remain positive so |5| = 5

helpwithfunctions · Answer

So then what does the =3 have to do with my problem? -|2x| = 3

helpwithfunctions · Answer

Does that make the answer to "-|2x| = 3" 2?

thesmartone · Answer

No, it is an equation

For example

-|3x| = -6

|3x| = 6

3x = 6 and 3x = -6
x = 2 and x = -2

BUT remember that the absolute value of something cannot equal a negative number. If you have a question like that, it means there is no solution