Math Problem Statement

Solve for x: (a) 4^(2x-1) = 1024 (b) 3^(2(9x-2)) = 27^(x+1) (c) If 2^y = 24, determine the value of x and z if x = 2^(y-2) and z = 3(2^(y+1))

Solution

Let's solve the equations from the image.

4. Solve for xx:

(a) 42x1=10244^{2x-1} = 1024

We can rewrite both sides using powers of 2: 42x1=(22)2x1=24x24^{2x-1} = (2^2)^{2x-1} = 2^{4x - 2} Also, 1024=2101024 = 2^{10}.

Now, we have: 24x2=2102^{4x-2} = 2^{10}

Equating the exponents: 4x2=104x - 2 = 10

Solve for xx: 4x=12x=34x = 12 \quad \Rightarrow \quad x = 3

(b) 32(9x2)=27x+13^{2(9x - 2)} = 27^{x+1}

Since 27=3327 = 3^3, we can rewrite the equation as: 32(9x2)=33(x+1)3^{2(9x - 2)} = 3^{3(x+1)}

Equating the exponents: 2(9x2)=3(x+1)2(9x - 2) = 3(x + 1)

Expand both sides: 18x4=3x+318x - 4 = 3x + 3

Solve for xx: 18x3x=3+415x=7x=71518x - 3x = 3 + 4 \quad \Rightarrow \quad 15x = 7 \quad \Rightarrow \quad x = \frac{7}{15}

(c) If 2y=242^y = 24, determine the value of xx and zz if x=2y2x = 2^{y - 2} and z=3(2y+1)z = 3(2^{y + 1}).

First, solve for yy: 2y=242^y = 24 Take the natural logarithm of both sides: yln2=ln24y=ln24ln2y \ln 2 = \ln 24 \quad \Rightarrow \quad y = \frac{\ln 24}{\ln 2} Using approximate logarithm values: y=ln24ln23.17810.69314.585y = \frac{\ln 24}{\ln 2} \approx \frac{3.1781}{0.6931} \approx 4.585

Now, solve for xx: x=2y2=24.5852=22.5856.059x = 2^{y - 2} = 2^{4.585 - 2} = 2^{2.585} \approx 6.059

Finally, solve for zz: z=3(2y+1)=3(24.585+1)=3(25.585)3×48.09=144.27z = 3(2^{y+1}) = 3(2^{4.585 + 1}) = 3(2^{5.585}) \approx 3 \times 48.09 = 144.27


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Related Questions:

  1. How can I simplify exponents when both sides have powers of the same base?
  2. How do logarithmic properties help in solving exponential equations?
  3. What is the general process for converting a non-power base to one with a common base?
  4. Can we solve for other variables using natural logarithms for bases that aren't powers of 2 or 3?
  5. How can I apply this method to solving more complex exponent problems?

Tip: When solving exponential equations, always try to express both sides with the same base for easier comparison of exponents.

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Math Problem Analysis

Mathematical Concepts

Exponential Equations
Logarithms
Powers of Numbers
Algebra

Formulas

a^x = a^y => x = y
Logarithmic Property: log_a(a^x) = x
Exponent Manipulation

Theorems

Exponent Rules
Logarithm Rules

Suitable Grade Level

High School (Grades 9-12)