Question

how to solve x cubed plus 27 equals 0

Answer 1

\[x^3 +27 = 0\]subtract -27 from both sides of the equation first.
Take the cube root of both sides of the function.
You will find your answer.

Answer 2

\[x^2+27=0\] one answer you get by thinking
the other two by factoring the sum of two cubes and using the quadratic formula for the second factor

Answer 3

the answer is 3 then

Answer 4

the cube root of -27 is -3.

-3 times -3=9 times -3 again is -27.

Answer 5

Not just 3.

\(3 \cdot 3 \cdot 3 \ne -27\)

Answer 6

@dtan5457 no answers.

Answer 7

oh no solution

Answer 8

False.

Answer 9

oh no

Answer 10

you want a number that when cubed give you
\[\huge \color{red}-27\]

Answer 11

oh gotcha i got tht one but thrs more lol

Answer 12

^-1

Answer 13

Whereas multiplying it an even number of times will result in a positive answer: (-1)(-1)(-1)(-1)

Answer 14

Any time you multiply a negative an odd amount of times, you will end up with a negative answer, i.e (-1)(-1)(-1) =-1

Answer 15

find the real solutions of x to the fourth plus 2x squared equals 5 using a graphing utility. round each solution to the nearest hundredth.

Answer 16

Can you write out your function first?

Answer 17

\[x ^{4} + 2x ^{3} = 5\]

Answer 18

Correction: \(x^4 +2x^2=5\)

Answer 19

on my paper its 2x cubed

Answer 20

davidellis17
find the real solutions of x to the fourth plus 2x squared equals 5 using a graphing utility. round each solution to the nearest hundredth.
2 minutes ago

On here you hae written 2x squared, so that is why I corrected you.

Answer 21

But ok, \(x^4 +2x^3=5\)

Answer 22

oh srry bout tht

Answer 23

Pull out the LCM, between \(x^4\) and \(x^3\) which one would it be?

Answer 24

3

Answer 25

Hmm... I'm not sure this function has any real solutions.

Answer 26

@satellite73 ? A little help here.

Answer 27

it would be so much easier if i had someone here lol

Answer 28

what about \[20 -\frac{ x }{ c } = d\] solve for x

Answer 29

so do you have a calculator?

Answer 30

yes

Answer 31

what type?

Answer 32

ti-30xa

Answer 33

that's not a graphing calculator... darn

Answer 34

ok so you have to do it the algebraic way instead of using a utility

Answer 35

alright

Answer 36

\[ x^4+2x^3=5\] SO you have that, now what is the biggest number/variable expression you can pull out of BOTH \(x^4\) and \(2x^3\)?

Answer 37

oh tht was a different prob but i guess x squared

Answer 38

x cubed

Answer 39

which is it xsquared or x cubed?

Answer 40

x cubed lol

Answer 41

okee dokey so do you know what that looks like when you pull it out?

Answer 42

can you "un"factor x^3?

Answer 43

well prob x plus 2x = 5

Answer 44

not quite,

Answer 45

well im stuck

Answer 46

it will be \[x^3(x+2)=5\]

You cannot forget to write the whole equation, and what is x^3/x^3?

Answer 47

graph \[y = \sqrt{x+5} -3\] find the domain and range

Answer 48

ya know what, let's just do it how the problem asked us to. Here use this as your graphing utility. https://www.desmos.com/calculator

Answer 49

ohh i have tht on my cromebook

Answer 50

just graph your eq and find the zeroes, it's way easier

Answer 51

if you had x^2 as you said prior it would be easy, but unfortunately, we do not

Answer 52

this stuff is not funn

Answer 53

to someone who doesn't get to do easy stuff often it is

Answer 54

lol thats rights

Answer 55

i just wish someone was here helping me

Answer 56

well, that's what your actual teacher is for...? Or you could always hire a tutor

Answer 57

ok i hire you to my house noww lol jk

Answer 58

you couldn't afford me :P

Answer 59

funny but prob true lol