2006-07-25 08:31:02 · 8 answers · asked by Little Birdie 2 in Education & Reference ➔ Homework Help
I got x = 9. Is that right? Here's the steps I took:
27^2 = x^3
729 = x^3
9 = x
If I'm not right, where did I go wrong? Thanks...
2006-07-25 08:36:20 · update #1
√(x³)=x^(3/2)=27
x=27^(2/3)
x=9
Edit: Yes, you did the problem correctly. Those posting conflicting answers simply don't understand the problem.
2006-07-25 08:37:16 · answer #1 · answered by Pascal 7 · 5⤊ 0⤋
3
3 x 3 x 3 = 27
2006-07-25 15:34:18 · answer #2 · answered by Karl the Webmaster 3 · 0⤊ 0⤋
x=9
2006-07-25 16:15:02 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Here is The Correct Answer
x^3 = 27
x^3 = 3^3
So x = 3 ###
so The answer is 3.
2006-07-25 17:39:13 · answer #4 · answered by Hsu Thet H 2 · 0⤊ 0⤋
Actually, there is one real and 2 imaginary answers, if you have learned to factor the diff. of two cubes.
You started right: x^3 = 729.
So x^3-729=0
Factoring, we get (x-9)(x^2+9x+81)=0.
You get x=9 from the first factor. From the second, you use the quadratic formula to get
x=[-9+/-sqrt(81-4*81)]/(2) = [-9+/-sqrt(-243)]/2
= [-9 +/- i*sqrt243]/2 = [ -9 +/- 9i*sqrt 3]/2 for the other 2 values of x.
2006-07-25 16:38:53 · answer #5 · answered by jenh42002 7 · 0⤊ 0⤋
243
2006-07-25 15:37:27 · answer #6 · answered by Snogood 3 · 0⤊ 0⤋
x^3= 27 then x= 3x3x3 and thats the same
2006-07-25 15:44:16 · answer #7 · answered by punkano09 2 · 0⤊ 0⤋
im thinking 9 for some reason
2006-07-25 15:34:22 · answer #8 · answered by Sweet Dreams 6 · 0⤊ 0⤋