Question

http://i64.tinypic.com/t82kk8.jpg How to prove E) ? I need to prove that i get the number after =

Answer 1

I don't understand, because its different from doing for example C), if i would do like C) i get BIG numbers so can anyone help to

Answer 2

simplify first, this is just a huge mess for practicing your exponent rules mainly,and a little algebra to boot

Answer 3

how do we work rewrite : (ab)^n ?

or: a^x * a^y

Answer 4

a^x+y

Answer 5

good,and a^n b^n

i get it to simplify to:1/(3(1+4))

but its all a matter of focusing and paying attention to what you are doing

get as many like bases as you can ... 3^x and 5^y are going to be what you want to look for

Answer 6

1/(3(1+3)) that is ....

Answer 7

as for the top, we can work it as:
\[3^{-3}*(5*3)^4\implies 3^{-3}*5^4*3^4\implies 3*5^4\]
now focus on the bottom

Answer 8

So 3^2*5*5^3+5^4*3^0(?not sure about this..)*3^7

Answer 9

??

Answer 10

not 3^0 :)

(3^2)^(-2) = 3^(2*(-2)) =3^(-4)

Answer 11

3^2 * 5 * 5^3 + 5^4 * 3^(-4) * 3^7

3^2 * (5 * 5^3) + 5^4 * (3^(-4) * 3^7)

3^2 * 5^4 + 5^4 * 3^3
^^^
3^2 * 3

factor out the commons:3^2 and 5^4

3^2 * 5^4 * (1+3) is our simplified denominator
--------------------

soooo

3 * 5^4 on top
----------------
3^2 * 5^4 * (1+3) on bottom

Answer 12

Why 3^2*3 ?? Sorry, i wanna understand because i have a test tomorrow! Thank u so much for helping me btw...