Math Is Fun Forum

bingbong

Member

Registered: 2016-03-04

Posts: 8

Algebra- Functions

1. Let A(t) = 3- 2t^2 + 4^t. Find A(2) - A(1).

2. Let
f(x)= (3x-7)/(x+1)
Find the domain of f. Give your answer as an interval.

3.The function f(x) satisfies
f(sqrt(x+1))=1/x
for all x>= -1, x is non zero. Find f(2)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Algebra- Functions

For 1) A(2) = 11 and A(1) = 5 so A(2) - A(1) = 6

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

bingbong

Member

Registered: 2016-03-04

Posts: 8

Re: Algebra- Functions

THanks, I figured out the problems. Now I need help on one geometry problem:

Find the largest real number x for which there exists a real number y such that x^2 + y^2 = 2x + 2y.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Algebra- Functions

I am getting

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

bingbong

Member

Registered: 2016-03-04

Posts: 8

Re: Algebra- Functions

Thanks