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In Each of Problems 1 Through 6 Determine Intervals in Which Solutions Are Sure to Exist

Introduction:

In mathematics, determining the intervals in which solutions are guaranteed to exist is crucial to solving various problems. In this article, we will explore problems 1 through 6 and analyze each one to determine the intervals in which solutions are sure to exist. We will also provide explanations and examples along the way to enhance understanding. So, let’s dive in!

Problem 1: Finding the Roots of a Quadratic Equation

When solving a quadratic equation of the form ax^2 + bx + c = 0, the solutions are guaranteed to exist if the discriminant, given by b^2 – 4ac, is greater than or equal to zero. This condition ensures that the quadratic equation has real roots. If the discriminant is positive, there will be two distinct real roots. If it is zero, there will be a repeated real root. If the discriminant is negative, the equation will have no real solutions.

Problem 2: Solving Linear Inequalities

When dealing with linear inequalities of the form ax + b < c or ax + b > c, the solutions are guaranteed to exist within specific intervals. To determine these intervals, we need to consider the sign of the coefficient ‘a’. If ‘a’ is positive, the solution exists in the interval where x is greater than or less than the value obtained by solving the equation ax + b = c. If ‘a’ is negative, the solution exists in the interval where x is less than or greater than the same value.

Problem 3: Determining the Domain of a Function

When finding the domain of a function, we need to identify any restrictions that may cause the function to be undefined. Common restrictions include square roots of negative numbers, division by zero, or logarithms of non-positive numbers. To determine the domain, we exclude these values from the real number line and state the remaining intervals where the function is defined.

Problem 4: Solving Trigonometric Equations

When solving trigonometric equations such as sin(x) = 0 or cos(x) = 1, the solutions are guaranteed to exist within specific intervals. Since trigonometric functions are periodic, their solutions repeat at regular intervals. For example, sin(x) = 0 has solutions at x = nπ, where n is an integer. Similarly, cos(x) = 1 has solutions at x = 2nπ, where n is an integer.

Problem 5: Finding the Domain of a Rational Function

Rational functions, which are ratios of polynomials, may have restrictions on their domains due to the presence of denominators. To determine the domain of a rational function, we exclude any values of ‘x’ that would cause the denominator to be zero. The remaining intervals on the real number line form the domain of the function.

Problem 6: Solving Systems of Linear Equations

When solving a system of linear equations, the solutions exist where the equations intersect. In other words, the system has a solution if the equations are not parallel or coincident. We can determine this by comparing the slopes and intercepts of the equations. If the slopes are different, the lines intersect at a single point, indicating a unique solution. If the slopes are the same and the intercepts differ, the lines are parallel and have no solution. If the slopes and intercepts are equal, the lines are coincident, resulting in infinitely many solutions.

FAQs:

Q1: Are these intervals the only possible solutions?

A1: No, these intervals represent the guaranteed solutions. There may be additional solutions outside these intervals, but they are not guaranteed.

Q2: How do I determine the intervals in which solutions exist?

A2: By analyzing the conditions or restrictions mentioned in each problem, such as discriminants, signs of coefficients, periodicity, or restrictions on the domain.

Q3: Can I use these methods for more complex problems?

A3: Yes, these methods can be extended to more complex problems. However, the approach may vary depending on the specific problem and mathematical concepts involved.

Q4: Why is it important to determine the intervals where solutions exist?

A4: Determining these intervals helps us understand the behavior of mathematical equations, functions, and systems. It allows us to identify possible solutions and study the relationships between different mathematical entities.

Conclusion:

Determining the intervals in which solutions are guaranteed to exist is a fundamental step in solving mathematical problems. By analyzing the specific conditions and restrictions in each problem, we can identify these intervals and gain valuable insights into the behavior of equations, functions, and systems. Whether it’s quadratic equations, linear inequalities, trigonometric equations, rational functions, or systems of linear equations, understanding these intervals is crucial for successful problem-solving in mathematics.

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