# Indicial Equations Help

1. Mar 13, 2009

### juliany

1. The problem statement, all variables and given/known data
I'm just confused about a few little indicial equations.

1. 3^2x-36X3^x=-243
2.5(x+2)^2=80

3. The attempt at a solution
1.3^2x X 3^x=-207

2.5(x^2+4x+4)=80
5x^2+20x+20=80
5x^2+20x=60

Unsure what to do after both of them.

2. Mar 13, 2009

### rock.freak667

For the first one....realize that 32x=(3x)2 and then put y=3x

For the second one, even though you didn't really need to square out and expand, just factorize it. But since 5 is a common factor, divide by 5 first.
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