# Math Help - :(---Rational Exponents---:(PLZ HELP

1. ## :(---Rational Exponents---:(PLZ HELP

^=exponent
X=multiply
x=variable

4^(-2)
4^(-3)-4^(0)

Solve for x:
3^(2x+1-x+2)=3^(x2-x)

Anyone know how to solve these???

2. Remember that x^(-1) = 1/x
Also remember that x^0 = 1

so 4^(-3) = 1/(4^3)

And

4^(-2)
4^(-3)-4^(0)

can be rewritten as

1/16
1/64-1

can you take it from there?

3. 3^(2x+1-x+2)=3^(x2-x)

take log_3 of both sides to render the equation

2x+1-x+2 = x2-x, did you mean x^2 instead of x2 anyway you can take it from here I'm sure.

4. ## Learn Latex, you will love it

BTW we usually use * for multiply to avoid confusion with the variable x

you can also learn latex and write stuff like this $\frac{1}{3 \cdot x^{-2}}$

click on it to find out what I did.

5. Thnx