Exercise 39 Page 304

Rewrite the terms so that they have a common base.

x=-3

Practice makes perfect

To solve the given exponential equation, we will start by rewriting the terms so that they have a common base.

4 (3^(-2x-4)) = 36

DivEqn

.LHS /4.=.RHS /4.

3^(-2x-4) = 36/4

CalcQuot

Calculate quotient

3^(-2x-4) = 9

WritePow

Write as a power

3^(-2x-4) = 3^2

Now we have two equivalent expressions with the same base. The Property of Equality for Exponential Equations says that if both sides of the equation are equal, the exponents must also be equal. 3^(-2x-4) = 3^2 ⇔ -2x-4 = 2 Finally, we will solve the equation -2x-4 = 2. <deduct> \text{-}2x-4 = 2 LHS+4=RHS+4 \text{-}2x = 6 .LHS /(-2).=.RHS /(-2). x = \dfrac{6}{\text{-}2} \MoveNegDenomT

oFrac x = \text{-}\dfrac{6}{2} Calculate quotient x = \text{-}3 </deduct>

Subchapter links

Communicate Your Answer p.299

Monitoring Progress p.300-302

Exercises p.303-304

Exercise 39 Page 304

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