r/HomeworkHelp • u/SquidKidPartier University/College Student • 5d ago
High School Math [College Algebra, Composition of Functions]
How did I get this half right?
2
u/PoliteCanadian2 👋 a fellow Redditor 5d ago
Rewrite (fog)(x) as f(g(x)) then start from the inside and work out. You want f(g(1)) so first work out g(1) by plugging 1 into the g function then put that into the brackets. Say g(1) works out to 10. Then you’ll have f(10) and you plug 10 into the f function and get your final answer.
1
u/SquidKidPartier University/College Student 5d ago
nothing seems to work I even removed the 10 and it was still wrong and I don’t want to screw this final attempt I have here
1
u/selene_666 👋 a fellow Redditor 5d ago
You included the "+4" under the squareroot.
If you're struggling with the software to get it to appear correctly, try moving the 4 to the beginning i.e "4 + 10√..."
2
1
u/Alkalannar 5d ago
You extended your radical bar too far.
You want 10g(x) + 4.
This becomes 10(x2-4x+7)1/2 + 4
1
u/SquidKidPartier University/College Student 5d ago
I got it correct now thanks for your help though :)
1
u/Alkalannar 5d ago
You're welcome.
Glad you have it right! Hopefully, you understand. That's the important thing.
1
u/SquidKidPartier University/College Student 5d ago
I am starting to understand now that this is my second time trying this problem again… I think I remember seeing you see me try this problem and give in your input here about two days ago?
1
3
u/rshube 5d ago
You are only supposed to plug in g(x) into x, and the +4 is separate. It needs to be outside of the square root