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91Ó°ÊÓ

Solve each equation by factoring. [Hint for: First factor out a fractional power.] $$ 6 x^{5}=30 x^{4} $$

Short Answer

Expert verified
The solution is \(x = 5\).

Step by step solution

01

Rewrite the Equation

Begin by rewriting the given equation. The original equation is:\[6x^{5} = 30x^{4}\].
02

Factor Out Common Terms

Identify the common terms on both sides of the equation. Here, both terms are divisible by \(6x^4\). Factor this out:\[6x^{4}(x) = 6x^{4}(5)\].
03

Simplify the Equation

Divide both sides by \(6x^4\) to isolate \(x\):\[x = 5\].
04

Verify the Solution

Substitute \(x = 5\) back into the original equation to check if both sides are equal:\[6(5)^5 = 30(5)^4\].Calculate both sides to confirm:\[6 imes 3125 = 30 imes 625\].Indeed, both sides equal \(18750\), confirming our solution is correct.

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Key Concepts

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

Factoring Polynomials
Factoring polynomials is a technique used to solve equations where polynomials, which are expressions consisting of variables and coefficients, are present. When you are asked to solve an equation by factoring, you are trying to rewrite the equation in a way that easier solutions can be derived.

To factor a polynomial, first look for common factors in each term. In our example, the equation is \(6x^{5} = 30x^{4}\). Both terms share the common factor \(6x^4\).
  • By factoring out \(6x^4\), we simplify the equation to \(6x^{4}(x) = 6x^{4}(5)\)
  • This shows that each side has a common component: \(6x^4\)
Reducing equations in this manner makes it possible to solve for the unknown variable by focusing only on the remaining factors. Factoring polynomials is especially useful for more complex algebraic equations, turning them into simpler, solvable forms.
Fractional Powers
Fractional powers involve exponents that are fractions, such as in expressions where the variable is raised to a power that is a fraction. However, in the context of our problem, we're more concerned about spotting powers of variable expressions that can be easily manipulated.

In our exercise, the term \(x^5\) is more cumbersome than \(x\). By factoring, we transform the difficult terms into something easier to manage. Here, the fractional sense comes when stripping down the larger powers, which helps in reducing the complexity of calculations. For example, recognizing that \(x^{5}\) can be rewritten as \(x^{4} imes x\), allows us to see the term more clearly in fractions or smaller powers to factor out redundant components.
  • In the given equation \(6x^5=30x^4\), breaking down the powers brings clarity
  • You factor out \(x^4\) to focus on what remains: namely, \(x\)
This mental step helps frame more complex expressions in a simpler mathematical form by effectively "reducing" powers through fractional understanding.
Verify Solutions
Once you've found a potential solution to an equation, verifying your result is crucial. This ensures the solution makes sense within the context of the original problem. Verification involves substituting the solution back into the original equation to check if it holds true.

For our example \(x = 5\), substituting 5 back into the initial equation \(6x^5 = 30x^4\), translates to: \(6(5)^5 = 30(5)^4\). If both sides are equal when evaluated:
  • Calculate \(6 \times 3125 = 18750\)
  • Calculate \(30 \times 625 = 18750\)
This equality assures us that the solution \(x = 5\) is indeed correct. Verifying solutions prevents errors and confirms the reliability of your factored pathways. Always perform this crucial step to solidify your confidence in the solutions you derive.

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Most popular questions from this chapter

ALLOMETRY: Dinosaurs The study of size and shape is called "allometry," and many allometric relationships involve exponents that are fractions or decimals. For example, the body measurements of most four-legged animals, from mice to elephants, obey (approximately) the following power law: $$ \left(\begin{array}{c} \text { Average body } \\ \text { thickness } \end{array}\right)=0.4 \text { (hip-to-shoulder length) }^{3 / 2} $$ where body thickness is measured vertically and all measurements are in feet. Assuming that this same relationship held for dinosaurs, find the average body thickness of the following dinosaurs, whose hip-toshoulder length can be measured from their skeletons: Triceratops, whose hip-to-shoulder length was 14 feet.

ALLOMETRY: Heart Rate It is well known that the hearts of smaller animals beat faster than the hearts of larger animals. The actual relationship is approximately (Heart rate) \(=250(\text { Weight })^{-1 / 4}\) where the heart rate is in beats per minute and the weight is in pounds. Use this relationship to estimate the heart rate of: A 625 -pound grizzly bear.

ATHLETICS: Cardiovascular Zone Your maximum heart rate (in beats per minute) may be estimated as 220 minus your age. For maximum cardiovascular effect, many trainers recommend raising your heart rate to between \(50 \%\) and \(70 \%\) of this maximum rate (called the cardio zone). a. Write a linear function to represent this upper limit as a function of \(x\), your age. Then write a similar linear function to represent the lower limit. Use decimals instead of percents. b. Use your functions to find the upper and lower cardio limits for a 20-year- old person. Find the cardio limits for a 60-year-old person.

Can the graph of a function have more than one \(x\) -intercept? Can it have more than one \(y\) -intercept?

The following function expresses an income tax that is \(15 \%\) for incomes below \(\$ 6000,\) and otherwise is \(\$ 900\) plus \(40 \%\) of income in excess of \(\$ 6000\). \(f(x)=\left\\{\begin{array}{ll}0.15 x & \text { if } 0 \leq x<6000 \\\ 900+0.40(x-6000) & \text { if } x \geq 6000\end{array}\right.\) a. Calculate the tax on an income of \(\$ 3000\). b. Calculate the tax on an income of \(\$ 6000\). c. Calculate the tax on an income of \(\$ 10,000\). d. Graph the function.

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