Are these problems a challenge to others as they are for me?

R

rainyday2003

New member
Joined
Jun 22, 2007
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ok , f(x)=x^2-2,then f(a+2)=?

Do I replace X with (a+2)?

f(a+2)=(a+2)^2-2=
I tried this but it just would not go togather.

I tried but I could not get it to work with the answer they gave me in my study guide.

answer is a^2+4a+2
how do I actually work it?
I tried subtracting (a+2) to both sides , I tried dividing (a+2) with (a+2)^2-2
please help me I need it bad. Sorry to say I do not know how to do any of this.
I am a mom of four trying to get into school.
thanks for your time.
 
Re: Are these problems a challenge to others as they are for

rainyday2003 said:
ok , f(x)=x^2-2,then f(a+2)=?

Do I replace X with (a+2)?

f(a+2)=(a+2)^2-2=
Click to expand...
That is right.

(a+2)^2 = a^2 +4a + 4

Subtract 2 and you are done.

f(a+2) = (a+2)^2 - 2 = a^2 +4a + 4 - 2 = a^2 +4a + 2

Are they challenging to others? Absolutely. Don't worry about that. You learn more when you struggle.
 
FOIL

wow. I have been trying to figure it out by doing functions,inverse or odd functions.wow i really made it harder than what it was. all i needed to do was seperate the (a^2+2) into (a+2)(a+2) and foil these two parenthieses not
(a+2)^2=a^2+4.

i honestly feel stupid . thank you so much for the help i have been setting here for days trying to figure it out.
since you have helped me so much could you figure this one out?

0*<x<90*, how many solutions are the for the equation 2 sin x = cos x?

someone already explained it but they are smarter than me in this problem and I do not understand their explaination at all.
i tried going online to find a explaination for dummys but had no luck.
even if you could tell me here to look for an explaination thats easy to follow.
thank you so much . you have made me smile
 
wow. I have been trying to figure it out by doing functions,inverse or odd functions.wow i really made it harder than what it was. all i needed to do was seperate the (a^2+2) into (a+2)(a+2) and foil these two parenthieses not
(a+2)^2=a^2+4
Click to expand...

I hope you meant:

all i needed to do was seperate the (a+2)^2 into (a+2)(a+2) and foil these two parenthieses not...

One of your problem could be that your fingers are running faster than your thoughts...
 
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