Question

Simplify: [3(n+1)!] / 5n!

Answer 1

3(n+1)n! / 5n! = 3(n+1)/5

Answer 2

how did u get that? do the factorials just cancel out??

Answer 3

i mean the n!...do they just cancel?

Answer 4

n! cancelled with n!

Answer 5

oh i see..can u tell me if my answers are right for some q's...its about finding teh domain and range

Answer 6

sure

Answer 7

1) \[f(x) = \sqrt{x-4} \] \[D = x \ge 4 \] \[R = y \ge 0\]

Answer 8

correct

Answer 9

\[2) f(x) = \sqrt{x ^{2} - 4} \]

D = x is greater tahn r equal to 2
R = all real numbers

Answer 10

\[3) f(x) = \sqrt{4-x ^{2}} \]
\[D = 2 \ge x \]
\[R = 2 \ge y \]

Answer 11

D = x is greater tahn r equal to 2 or x is less tahn r equal to -2

Answer 12

so both ar the solutions?

Answer 13

this for #2

Answer 14

yes both

Answer 15

ok...

Answer 16

is the range correct

Answer 17

for number 2

Answer 18

R = all real numbers ( wrong)

Answer 19

since we have a suare root the range always greater than or equal to 0

Answer 20

so \[R = y \ge 0\]

Answer 21

yes

Answer 22

now #3

Answer 23

D= x greater than or equal -2 and less than or equal 2

Answer 24

R= like # 2 Range

Answer 25

what is the diffence between how u wrote teh domain for 2 was x is g=2 OR x is less =-2
and when u used AND for number 3

Answer 26

see the drawing we take the positive area only

Answer 27

do you have an idea about the method of how to know the signs of quadratic experession?

Answer 28

um i dont rember..dont u just substitute numbers to see if it fits teh solution

Answer 29

yes this is one way, it's ok , but there is another one

Answer 30

------ -2 -------- 2 ------ x2-4

Answer 31

we have here 3 area, one less than -2, the 2nd betwn -2 and 2 , and the third are greater than 2

Answer 32

to put signs look to the coefficent of X^2 is positive or negative?

Answer 33

the middle area alway opposit to the sign of x^2 coeffcient

Answer 34

and the other area are like the sign of x^ cofficient

Answer 35

that's it

Answer 36

but you can yours

Answer 37

i have one more question to find domain n range

Answer 38

ok , np

Answer 39

\[f(x) = \sqrt{x ^{2}+44}\]

d = all real #'s and r = y is greater tahn = sqrt of 44 ....im confused about this one

Answer 40

d = all real #'s ( correct )

Answer 41

range is the same as the one before

Answer 42

but in y = [sqrt(x^-4) ] +3 ===? (domain greatrer or equal 3

Answer 43

anyway I don wanna cuase you headache

Answer 44

:)

Answer 45

which q are u talkin about? but in y = [sqrt(x^-4) ] +3 ===? (domain greatrer or equal 3

Answer 46

or is that sthn u just wanted to point out?

Answer 47

that is from my mind :)

Answer 48

oh i see...thnanks...how bout if smthng is f(x) cube root of x?? is the domain and range both all real numbers

Answer 49

yes , exactly

Answer 50

and for absolute value??
\[\left[ x+3 \right]-2 \]
is teh d = all real numbers and r=[-2, infinity)

Answer 51

perfect

Answer 52

soory i'm such a bother but i just want to compeltely understand domain and ranges...

Answer 53

\[x ^{2}+y ^{2} = 25\]
D= [-5,5] and R = [-5,5] ...is this true?

Answer 54

yes correct, and np ask anything sabrina

Answer 55

can u help me explain how to write rectangular equation? liek the question is eliminate the parameter t and then write a rectangulat equation for
\[x=t ^{2} + 3\] \[y=2t \]

Answer 56

ok no problem...

Answer 57

wat is ur email?

Answer 58

ok?

Answer 59

u can delete it now..i copied it..thnanks

Answer 60

ok see ypu sabrian and don hesitate to ask anything here or email , g2g sabrina bye

Answer 61

bye..thnks again