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HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2010 Hawkes Learning Systems. All rights reserved. Radical Functions For example, consider the equation From this, we obtain the solution that. We have gained a second (and false) solution. Square both sides. Square root both sides.

HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2010 Hawkes Learning Systems. All rights reserved. Solving Radical Equations Method of Solving Radical Equations (Cont.) Step 3: If any radical expressions remain, simplify the equation if possible and then repeat steps 1 and 2 until the result is a polynomial equation. When a polynomial equation has been obtained, solve the equation using polynomial methods. Step 4: Check your solutions in the original equation. Any extraneous solutions must be discarded.

HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2010 Hawkes Learning Systems. All rights reserved. Example 1: Solving Radical Equations Solve the radical equation. Step 1: Isolate the radical expression. Step 2: Square both sides. Step 3: Solve the polynomial equation. Note: Both roots satisfy the original equation.

HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2010 Hawkes Learning Systems. All rights reserved. Solving Radical Equations Caution! Substitute solutions back into the original equation to check them! Some solutions may not fit, and are therefore extraneous.

HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2010 Hawkes Learning Systems. All rights reserved. Solving Equations with Positive Rational Exponents o Equations containing terms with positive rational exponents can be viewed as radical equations. o Rewriting each term that has a positive rational exponent as a radical will allow us to use the method developed previously to solve rational equations.

HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2010 Hawkes Learning Systems. All rights reserved. Example 4: Equations with Positive Rational Exponents Solve the following equation with a rational exponent. Step 1: Isolate the term containing the rational exponent. Step 2: Cube both sides to eliminate the cubed root. Step 3: Take the square root of both sides. Step 4: Verify that both numbers satisfy the original equation.

HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2010 Hawkes Learning Systems. All rights reserved. Example 5: Equations with Positive Rational Exponents Solve the following equation with a rational exponent.