Functions help? (1 Viewer)

[findsome1]

Aye

I started doing functions in the holiday and I came over this question:

Find g(x-1) when g (x)= x^2+2x+3


but I don't get it , do I add -1 to every x value or something?

The book says answer is x^2+2



Im in year 11

 

[SeCKSiiMiNh]

Aye

I started doing functions in the holiday and I came over this question:

Find g(x-1) when g (x)= x^2+2x=3


but I don't get it , do I add -1 to every x value or something?

The book says answer is x^2+2



Im in year 11

no, whereever the "x" is in g(x), you simply replace those with (x-1)
(x-1)^2 + 2(x-1) = 3

 

[ohexploitable]

You pretty much replace all x's with (x-1) so...

 

[findsome1]

OMG I GET IT NOW... thanks guys

 

[hscishard]

I misread the question
Thought it was if g(x+1) = x^2+3x+2 find g(x).
A question from the fitzpat book.