please help

missunique · #1 $Old$ July 1st, 2008, 07:16 PM

check if im right!
(2x^3y^-2)^-2 = y^4/4x^6
-5x^2y^4z^6/45x^7y^-8z^4 = -y^12z^2/9x^5
6.2 * 10^4/3.1*10^-2 =2.6*10^6 = 2000000
(3.25*10^-6)*(2.4*10^2) = 7.8*10^4

M= cubed root 1-p, when p=28
is M = to -3?

Thanks in advance!

Reckoner · #2 $Old$ July 1st, 2008, 07:30 PM

Quote:

Originally Posted by missunique $View Post$

check if im right!
(2x^3y^-2)^-2 = y^4/4x^6 [Yes!]
-5x^2y^4z^6/45x^7y^-8z^4 = -y^12z^2/9x^5 [Yes!]
6.2 * 10^4/3.1*10^-2 =2.6*10^6 = 2000000 [Yes!]
(3.25*10^-6)*(2.4*10^2) = 7.8*10^4 [Yes!]

M= cubed root 1-p, when p=28
is M = to -3? [Yes!]

Thanks in advance!

One thing though: your notation is a little ambiguous. When writing expressions in this way, it is conventional to perform multiplication and division from left to right, so that your denominators should really be placed in parentheses if these are to be correct (this problem does not arise when using the normal $\frac ab$ notation, however).

missunique · #3 $Old$ July 1st, 2008, 07:37 PM

thanks for that. i really appreciate it.