Solve the equations:(adsbygoogle = window.adsbygoogle || []).push({});

a) 25^{3x}= 1/5^{2-x}

This is what i've done but i don't know if it's right so i need someone to check it for me please.

(5^{2})^{3x}= (5^{-1})^{2-x}

6x = -2+x (x powers)

5x=-2

x= -2/5

b)3x^{-1/2}- 4 = 0

errm....i'm kinda stuck on this one, could someone start me off please?

3x^{-1/2}= 4

c) find the value of y

4^{y+1}=8^{2y-1}

here's what i did:

(2^{2})^{y+1}= (2^{3})^{2y-1}

2y+2=6y-3 (powers)

4y-5=0

y=5/4

Is that right?

Thanks in advance!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Equations -check pls!

**Physics Forums | Science Articles, Homework Help, Discussion**