# Function:when you set x equal to something, you use brackets, right? (example inside)

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I was always sure you use brackets but lately a certainly question had shaken my confidence. Can you confirm one uses brackets when settings the x equal to something in a function f(x).

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tiny-tim
Homework Helper
Hi Femme_physics!

(wouldn't it have been quicker to type it rather than attach a picture? )

If f(x) = -x2 + 4

then f(-10) = -(-10)2 + 4.

I don't know what --102 + 4 would mean, but I suspect it would be --(102) + 4 = (102) + 4

Gold Member

Tiny-tim! Good to see you! Where've you been hiding? ^^ :)

Hi Femme_physics!

(wouldn't it have been quicker to type it rather than attach a picture? )
LMAO! Force of habit!

If f(x) = -x2 + 4

then f(-10) = -(-10)2 + 4.

I don't know what --102 + 4 would mean, but I suspect it would be --(102) + 4 = (102) + 4
Heh, yes. So it's settled, you use brackets.

tiny-tim
Homework Helper
Tiny-tim! Good to see you! Where've you been hiding? ^^ :)
finding nemo!

where were you?

Gold Member

Hehe. You know I'm always here, distraught about some new statics problem. My lovely guardian angel these days is I like Serena :) But you're also always welcome to flop those golden fins, sending me ripples of comprehension in my quest to understand mechanics^^

Mark44
Mentor

I don't know what --102 + 4 would mean, but I suspect it would be --(102) + 4 = (102) + 4
Clearly, --102 + 4 means 92 + 4 = 85.

Similarly, ++102 + 4 would be 112 + 4 = 125

BTW, some of us on the west side of the Atlantic call these things - [] - brackets, these things - {} - braces, these things - <> - angle brackets, and these things - () - parentheses. I understand that the terminology is somewhat different in GB.

Char. Limit
Gold Member

these things - <> - angle brackets
Oh, is that what they're called? I just call them arrow thingies.

Gold Member

Oh, is that what they're called? I just call them arrow thingies.
Aherm, vector notation on the Cartesian plane. Check yourself before you wreck yourself ;)

Char. Limit
Gold Member

To be fair, I also call brackets "square thingies" and paretheses "round thingies".

Gold Member

To be fair, I also call brackets "square thingies" and paretheses "round thingies".
LOL. I actually knew you were joking, Char, I just wanted to jokingly patronize over you and sound smart for a milisecond :D

Char. Limit
Gold Member

LOL. I actually knew you were joking, Char, I just wanted to jokingly patronize over you and sound smart for a milisecond :D
Huh? I'm not joking. That's actually what I call them.

Mark44
Mentor

|| - straight thingies?
& - curly thingy?
~ - wavy thingy?

Char. Limit
Gold Member

See, Mark gets me! Oh, and these: {} are pointy thingies.