To convert the coordinates of the vertex to fractions, go to the home screen and select Frac from the Math menu. The vertex is then a1 2 , 25 4 b as shown on the screen at the right below. Find the x-intercepts, y-intercept, and vertex using a graphing calculator. 1) y x2 2x 3 2) y x2 4x 5 3) y (x 1)2 9 4) y x2 9 5) y x2 4x 4 6) y x2 6x 10 ANSWERS TO YOU TRY EXERCISES 1) x y 5 5 5 5 y x2 3 2) x 4 y 6 4 6 y (x 3)2 3) x y 10 y x2 6x 8 (3, 1) 10 10 10 4) x y 6 (2, 2) (6, 2) 2 8 (4 √2, 0) 4 (4 √2, 0) (4, 2) y x2 8x 14 ANSWERS TO TECHNOLOGY EXERCISES 1) x-intercepts (1, 0), (3, 0); y-intercept (0, 3); vertex (1, 4) 2) no x-intercepts; y-intercept (0, 5); vertex (2, 1) 3) x-intercepts (2, 0), (4, 0); y-intercept (0, 8); vertex (1, 9) 4) x-intercepts (3, 0), (3, 0); y-intercept (0, 9); vertex (0, 9) 5) x-intercept (2, 0); y-intercept (0, 4); vertex (2, 0) 6) no x-intercepts; y-intercept (0, 10); vertex (3, 1) www.mhhe.com/messersmith SECTION 10.4 Graphs of Quadratic Equations 637
messersmith_power_introductory_algebra_1e_ch4_7_10
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