The solutions for an equation are also referred to as the roots of the equation. The roots of an equation are related to the zeros of the related function.

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Presentation transcript:

The solutions for an equation are also referred to as the roots of the equation. The roots of an equation are related to the zeros of the related function. The roots of an equation are related to the x-intercepts of the graph of the related function. Math 30-11

Solving Rational Equations Determine if each of the following statements are true or false: 1. x = 2 is a solution to 2. x = –3 is a solution to 3. The equation has exactly 2 solutions. Math 30-12

Solve: LCD: (x + 2)(x – 2) NPVs are  2 Solving Equations with Rational Expressions - Algebraically Multiply all terms by the LCD Math 30-13

Verify your solutions by substitution! x = –3 x = 1 Math 30-14

Solving Equations with Rational Expressions - Graphically Rewrite the equation equating it to 0. Graph the related function. The roots of the equation are the x-intercepts of the graph: x = –3 and x = 1. Math 30-15

NPV is –3 Solving Equations w/ Rational Expressions - Algebraically Solve: LCD: x + 3 Math 30-16

Solving Equations Graphically Method 2 Graph the expression on each side of the equals sign and then locate the points of intersection. Graph: The solution is where the graphs intersect at x = 4. Math 30-17

Solving Equations with Rational Expressions - Your Turn Solve: LCD: 6(x – 2) NPV is 2 Math 30-18

A car travels 500 miles in the same time that a train travels 300 miles. The speed of the car is 30 miles per hour faster than the speed of the train. Determine the speed of the car and the train. Let r = speed of the train r + 30 = speed of the car Car’s Time = Train’s Time Solve a Problem Using Rational Equations Math 30-19

LCD: r(r + 30) NPVs are 0, –30 The car travels at a speed of 75 mph The train travels at a speed of 45 mph Solve a Problem Using Rational Equations Math

Math Page 465 1, 2, 5, 6, 10, 11, 12, 13