# Math Help - Writing an expression to a power with positive exponents.

1. ## Writing an expression to a power with positive exponents.

Can someone explain to me why...
x^7/2 x (x) = x^9/2 ?

2. ## Re: Writing an expression to a power with positive exponents.

Originally Posted by gideonrichter
Can someone explain to me why...
x^7/2 x (x) = x^9/2 ?
$x^a \cdot x^b=x^{a+b}$

3. ## Re: Writing an expression to a power with positive exponents.

Originally Posted by gideonrichter
Can someone explain to me why...
x^7/2 x (x) = x^9/2 ?
Please use * for multiplication sign...plus brackets when necessary:
x^(7/2) * x^1 = x^(7/2) * x^(2/2) = x^(7/2 + 2/2) = x^(9/2)