Solve Indicial Equations with Step-by-Step Homework Help

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SUMMARY

This discussion focuses on solving indicial equations, specifically the equations 3^(2x) - 36*3^x = -243 and 5(x+2)^2 = 80. The first equation can be simplified by recognizing that 3^(2x) can be expressed as (3^x)^2, allowing for substitution with y = 3^x. The second equation involves factoring after dividing by the common factor of 5, leading to a quadratic equation that can be solved for x.

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juliany
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Homework Statement


I'm just confused about a few little indicial equations.

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


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.
 
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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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