Problem 75 Solve each equation. $$(t-1)^{... [FREE SOLUTION] (2024)

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Chapter 7: Problem 75

Solve each equation. $$(t-1)^{-2 / 3}=2$$

Short Answer

Expert verified

The solution for \( t \ is approximately \( 1.3536 \).

Step by step solution

01

Understand the Equation

The given equation is \( (t-1)^{-2/3} = 2 \). The goal is to solve for \ t \.

02

Isolate the Variable Expression

To isolate \( t \), first rewrite the equation by eliminating the negative exponent. Raise both sides of the equation to the power of \ -3/2 \ to cancel out the exponent on the left. \[ ((t-1)^{-2/3})^{-3/2} = 2^{-3/2} \]

03

Simplify the Exponentiation

By multiplying the exponents on the left side: \[ (t-1)^{(-2/3) \times (-3/2)} = 2^{-3/2} \] The left side simplifies to \( t-1 \), so the equation becomes: \[ t-1 = 2^{-3/2} \]

04

Evaluate the Right Side

Calculate \( 2^{-3/2} \): \[ 2^{-3/2} = (2^{-1})^{3/2} = (1/2)^{3/2} = 1/\big(\frac{ewline{2\textrm{ to the power }}3/2}\big) \] Since \( (1/2) \) raised to any positive power is a positive fraction, \ 1/(2^{3/2}) = 1/\big(2\textrm{ raised to the power }1.5\big)\approx 0.3536.\

05

Solve for t

Add 1 to both sides to solve for \( t \): \[ t-1=0.3536 \rightarrow t = 0.3536 + 1 \rightarrow t \approx 1.3536 \]

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Negative Exponents

Negative exponents might look complicated, but they're not too hard to understand. A negative exponent means you take the reciprocal of the base and then apply the positive exponent. For example, \(a^{-n} = \frac{1}{a^n}\). If you have \(2^{-3}\), it becomes \(1/2^3\). This equals \(1/8\). When solving equations like \text{(t-1)}^{-2/3}=2\, you must eliminate the negative exponent by raising both sides to the power of the reciprocal of \ \ \( -2/3 \), which is \-3/2\. This makes the equation easier to handle.

Isolating Variables

One key part of solving equations is isolating the variable. This usually means getting the variable by itself on one side of the equation. Let's take our equation \(\text{(t-1)}^{-2/3}=2\).First, we dealt with the exponent. Now, we isolate the expression with \text{t}\. This step often involves reversing operations. Add, subtract, multiply, or divide both sides of the equation as needed. In our solution, after simplifying the exponent and getting \(\text{t}-1\), we finally add 1 to both sides to isolate \text{t} on one side. This gets us our final answer.

Exponent Rules

Understanding exponent rules is crucial when solving algebraic equations. These rules help us manipulate and simplify expressions with exponents. Here are some essential exponent rules:

  • Product of Powers: \(a^m \cdot a^n = a^{m+n}\)
  • Power of a Power: \(\text{(a}^m\text{)}^n = a^{mn}\)
  • Quotient of Powers: \(\frac{a^m}{a^n} = a^{m-n}\)
  • Power of a Product: \(\text{(ab)}^n=a^n\cdot b^n\)
  • Negative Exponent: \(a^{-n} = \frac{1}{a^n}\)}

In our exercise, we used the power of a power rule to simplify \(\text{((t-1)}^{-2/3})^{-3/2}\right)\), which equals \(\text{t-1}\). Learning these rules makes working with exponents much easier!

Fractional Exponents

Fractional exponents might seem tricky at first, but they're simply another way to represent roots and powers. A fractional exponent \(a^{m/n}\) means the \(n\)th root of \(a\) raised to the \(m\)th power. For example, \(8^{2/3}\) means \(\sqrt[3]{8^2}\). Here's a quick breakdown:

  • The denominator (bottom number) of the fraction tells you the root.
  • The numerator (top number) tells you the power to which the base is raised.
    For our exercise, we simplified \(\text{(t-1)}^{-2/3}\) by raising both sides to the power of \-3/2\. This \cancelled\ the fractions, simplifying the equation steps later.

Remember, practice makes perfect! The more you work with these, the easier they'll become!

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Problem 75 Solve each equation. $$(t-1)^{... [FREE SOLUTION] (3)

Most popular questions from this chapter

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Problem 75 Solve each equation.  
$$(t-1)^{... [FREE SOLUTION] (2024)
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