# algebra

posted by .

confrused with this one too let f(x)=x^2+6 and g (x) =4x-5 find (f ° g)(-7)

• algebra -

just plod along

first do g(-7)

then do f(whatever you got for g)

• algebra -

i got -55/7 is that right?

• algebra -

g(-7) = 4(-7) - 5 = -28 - 5 = -33

f(-33) = (-33)^2 + 6 = 1095 ???

• algebra -

according to my multiple choices its a fraction a -55/7 b 384/7 c 295/49 d 63/55

• algebra -

Then there is a typo somewhere. There was no divide in the problem statement. Perhaps at x = -1/7 ??

• algebra -

f(x)=x^2+6 and g (x) =x +8/xfind (f ° g)(-7) yep there was sorry

• algebra -

are you absolutely sure g(x) is not (x+8)/x ??

• algebra -

if g(x) = (x+8)/x
then
g(-7) = -1/7
then
f(-1/7) = 1/49 + 6
= 1/49 + 294/49
= 295/49

• algebra -

BUT
if it is as you wrote it

f(x)=x^2+6 and g (x) =x +8/xfind (f ° g)(-7) yep there was sorry

then
g(-7) = -7 + 8/-7
= -49/7 - 8/7=
= -57/7
the f(-57/7) = 57^2/49 +294/49
=3249/49 + 294/49
= 3543/49
which is not even on the list

• algebra -

ok then the other one is right im sorry and thank you

• algebra -

You are welcome

## Similar Questions

1. ### Algebra-One to one function

Could you please check my answers and help me with one of them?
2. ### Algebra

I need help on one particular part of algebra because i forgot what my teacher said! Here is the question: Directions: Find the x- intercept of the graph of the equation. 1. x+ y= 5
3. ### algebra

confrused with this one too let f(x)=x^2+6 and g (x) =4x-5 find (f ° g)(-7) still don't get it and no one responds to my replys after the tutors assist
4. ### Algebra Help Inverse One-to-one

I need to know if I have done this correctly. Problem If f is one-to-one, find an equation for its inverse. f(x)=x^3-5 y=x^3-5 x=y^3-5 5+x=y^3-5+5 5+x=y^3 My answer: y^3=5+x 3ãy=3ã5+x y=3ã5+x f^-1(x)3ã5+x
5. ### Algebra Help Inverse One-to-one

Did I do this right? Problem: If the following defines a one-to-one function, find its inverse. If no, write "Not one-to-one." {(-2,4),(-1,4),(0,1),(1,-5)} answer: Not one-to-one because of (-2,4), (-1,4)
6. ### ALGEBRA

I need to find a slope and y intercept of the line and write the fractional answers in lowest terms. 2y+8x+3=12+8x; I would like to try this one and get your input. 2y+8x-8x-12-3; 2y/2 = 9/2; y = 9/2 however I did not find the slope. …
7. ### pre-algebra

Use algebra tiles to find the difference. Let one white tile equal +1 and one black tile equal –1.
8. ### pre-algebra

Use algebra tiles to find the difference. Let one white tile equal +1and one black tile equal -1.6-(-9) Thanks
9. ### algebra

1. the function f(x)=6x/3x-5 is one to one. find its inverse and check your answer. And on the second one can you tell me if I am correct. 2. solve the following exponential solution 7^2x+7^x+1-60=0 7^2 x+7^x-59=0 (49x)+7^x-59=0 49x/49=0/49 …
10. ### Algebra 2

Hello can you please help me to generate a number line to use in Algebra. Can you attach one for me and where can I find one on line that is printable. Thank You.

More Similar Questions