# U2L2N2 and N3

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Education

Published on March 2, 2014

Author: ecuaopi08

Source: authorstream.com

Unit 2 Lesson 2 Notes 2 and 3: Unit 2 Lesson 2 Notes 2 and 3 Solve a quadratic equation using the graphing calculator (Area problems). Step 1: Make sure the equation is set equal to 0. Step 2: Press Y =, in Y1 enter the equation, in Y2 enter 0. Step 3: Press Graph or Zoom 6:Standard 1 st Solution: Press 2 nd , Press Trace, Press 5, Press Enter (3 times) 2 nd Solution: Press 2 nd , Press Trace, move the cursor to the 2 nd x-intercept, Press Enter (3 times) Make sure the answers make sense (be careful of negative answers). PowerPoint Presentation: Let ’ s look at an example. The length of a rectangle is 9 inches greater than the width. The area is 36 inches squared. Find the length and width. A = 36 in 2 L = W + 9 W L X W = A (W + 9)W = 36 (W + 9)W – 36 = 0 Use the calculator steps to solve for L and W. PowerPoint Presentation: We get the answers 3 and -12. -12 can’t be the length or width because there is no such thing as a negative measurement. 3 is the answer that makes sense so 3 is the width. The length is 3 + 9 which is 12. W = 3 and L = 12

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