College Algebra: A Graphing Approach by Ron (Ron Larson) Larson, Robert P. Hostetler, Bruce H.

By Ron (Ron Larson) Larson, Robert P. Hostetler, Bruce H. Edwards

I bought this as a complement to the Onliine algebra classification i am taking. supplies a few solid principles on use of the graphing calculator.

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3x2 Ϫ x ϩ c 176. 2x2 ϩ 9x ϩ c 177. Geometry The cylindrical shell shown in the figure has a volume of V ϭ ␲R 2h Ϫ ␲ r 2h. (a) Factor the expression for the volume. (b) From the result of part (a), show that the volume is 2␲ (average radius)(thickness of the shell)h. R h r 179. The product of two binomials is always a seconddegree polynomial. 180. The difference of two perfect squares can be factored as the product of conjugate pairs. 181. The sum of two perfect squares can be factored as the binomial sum squared.

2Ί3 2 3 Ί 5 Solution a. b. 5 2Ί3 2 3 Ί 5 ϭ 5 2Ί3 и Ί3 Ί3 Ί3 is rationalizing factor. ϭ 5Ί3 2͑3͒ Multiply. ϭ 5Ί3 6 Simplify. ϭ ϭ 2 3 Ί 5 и 3 52 Ί 3 2 Ί 5 3 52 3 25 2Ί 2Ί ϭ 3 5 Ί53 Checkpoint Now try Exercise 67. 3 52 Ί is rationalizing factor. Multiply and simplify. STUDY TIP Notice in Example 11(b) that the numerator and denominator 3 2 to proare multiplied by Ί 5 duce a perfect cube radicand. 2 Example 12 Exponents and Radicals Rationalizing a Denominator with Two Terms Rationalize the denominator of 2 .

To add or subtract rational expressions, you can use the LCD (least common denominator) method or the basic definition ad ± bc a c ± ϭ , b d bd b 0 and d 0. Basic definition This definition provides an efficient way of adding or subtracting two fractions that have no common factors in their denominators. Example 6 Subtract Subtracting Rational Expressions 2 x from . 3x ϩ 4 xϪ3 Solution 2 x͑3x ϩ 4͒ Ϫ 2͑x Ϫ 3͒ x Ϫ ϭ x Ϫ 3 3x ϩ 4 ͑x Ϫ 3͒͑3x ϩ 4͒ ϭ ϭ ϩ 4x Ϫ 2x ϩ 6 ͑x Ϫ 3͒͑3x ϩ 4͒ 3x 2 3x 2 ϩ 2x ϩ 6 ͑x Ϫ 3͒͑3x ϩ 4͒ Checkpoint Now try Exercise 45.

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