Anyone know how to do functions 😖 Watch

Fayeeeee
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I really don’t understand them please help
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RDKGames
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(Original post by Fayeeeee)
I really don’t understand them please help
What don't you get??

f(x) = 3x-2, so when we say f(\text{number}) we look at 3x-2 and replace x by (\text{number}) before simplifying everything.

So f(2) = 3(2)-2 = 6-2 = 4.

Same idea for pretty much the first half of these questions.
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Fayeeeee
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(Original post by RDKGames)
What don't you get??

f(x) = 3x-2, so when we say f(\text{number}) we look at 3x-2 and replace x by (\text{number}) before simplifying everything.

So f(2) = 3(2)-2 = 6-2 = 4.

Same idea for pretty much the first half of these questions.
(Original post by RDKGames)
What don't you get??

f(x) = 3x-2, so when we say f(\text{number}) we look at 3x-2 and replace x by (\text{number}) before simplifying everything.

So f(2) = 3(2)-2 = 6-2 = 4.

Same idea for pretty much the first half of these questions.
Ahh thanks, my teachers not the best😂
I don’t understand the ones past 5 thou
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RDKGames
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(Original post by Fayeeeee)
Ahh thanks, my teachers not the best😂
How do you do the ones for number 2 thou ?
Same thing!

f(3) + g(-2) means you work out f(3) first of all, then g(-2).

Then add them.
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Fayeeeee
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(Original post by RDKGames)
Same thing!

f(3) + g(-2) means you work out f(3) first of all, then g(-2).

Then add them.
Ahh, I realised after I wrote it ahah
I don’t understand any past 5 thou, how do you apply it?
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RDKGames
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(Original post by Fayeeeee)
Ahh, I realised after I wrote it ahah
I don’t understand any past 5 thou, how do you apply it?
What do you mean? The questions 5, 6, 7 define new functions but the process is the same.
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Fayeeeee
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(Original post by RDKGames)
What do you mean? The questions 5, 6, 7 define new functions but the process is the same.
Ohh right thankss
Last question 😂, for 8/9/10 are you working backwards I don’t really know
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RDKGames
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(Original post by Fayeeeee)
Ohh right thankss
Last question 😂, for 8/9/10 are you working backwards I don’t really know
Working backwards?? Not sure what you mean.

A function f is defined as 2x+2, and then as 8. Since these represent the same function, they must be equal: 2x+2=8. This allows you to solve for x.

Same process for all three.
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ThunderBeard
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yep, for 8 it is 2x+2=8 and rearrange
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Fayeeeee
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(Original post by RDKGames)
Working backwards?? Not sure what you mean.

A function f is defined as 2x+2, and then as 8. Since these represent the same function, they must be equal: 2x+2=8. This allows you to solve for x.

Same process for all three.
Ahhhh, thank you so much you’ve really helped me and I appreciate it allot! 🙂
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Fayeeeee
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(Original post by ThunderBeard)
yep, for 8 it is 2x+2=8 and rearrange
😊 thank you
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