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Unit 3 – Quadratic Functions Date: 3.5 Quadratic Function Models: Solving Quadratic Equations Homework: Page 177178: Questions #1, 2, 4{a,c,d,f}, 6{a,c}, 8, 10, 12, 16, 17 Learning Objectives/Success Criteria: At the end of this lesson I will be able to: Find the solutions (zeros or xintercepts) of a quadratic equation using different methods: o Factoring o Quadratic formula Express the solutions exactly using radicals or rational numbers or approximately using decimals Any solution of an equation that does not work in the context of a problem is said to be an inadmissible solution (or not admissible). 1. Three pieces of rod measures 20 cm, 41 cm, and 44 cm. If the same amount is cut off from each piece, the remaining lengths can be formed into a right triangle. Determine the length that should be cut off for each piece. 2. Find two consecutive whole numbers such that the sum of their squares is 265. 3. The sum of the squares of three consecutive integers is 194. Determine the integers. 4. The sum of two numbers is 24 and the sum of the squares is 306. What are the numbers? 5. What is the equation of a quadratic with the zeros 5 and 1 and passing through the point (3,24)?

3.5 Quadratic Function Models

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Page 1: 3.5 Quadratic Function Models

Unit  3  –  Quadratic  Functions                 Date:  3.5  Quadratic  Function  Models:  Solving  Quadratic  Equations  

 Homework:    Page  177-­‐178:  Questions  #1,  2,  4{a,c,d,f},  6{a,c},  8,  10,  12,  16,  17    Learning  Objectives/Success  Criteria:    At  the  end  of  this  lesson  I  will  be  able  to:  

• Find  the  solutions  (zeros  or  x-­‐intercepts)  of  a  quadratic  equation  using  different  methods:  o Factoring  o Quadratic  formula  

• Express  the  solutions  exactly  using  radicals  or  rational  numbers  or  approximately  using  decimals    

Any  solution  of  an  equation  that  does  not  work  in  the  context  of  a  problem  is  said  to  be  an  inadmissible  solution  (or  not  admissible).  

 1. Three  pieces  of  rod  measures  20  cm,  41  cm,  and  44  cm.    If  the  same  amount  is  cut  off  from  each  piece,  

the  remaining  lengths  can  be  formed  into  a  right  triangle.    Determine  the  length  that  should  be  cut  off  for  each  piece.  

 2. Find  two  consecutive  whole  numbers  such  that  the  sum  of  their  squares  is  265.  

 3. The  sum  of  the  squares  of  three  consecutive  integers  is  194.    Determine  the  integers.  

 4. The  sum  of  two  numbers  is  24  and  the  sum  of  the  squares  is  306.    What  are  the  numbers?  

 5. What  is  the  equation  of  a  quadratic  with  the  zeros  5  and  -­‐1  and  passing  through  the  point  (3,-­‐24)?