Post on 18-Jan-2016
Using the Calculator to solve an Equation
Bell Ringer 63: 5/10
1. MC: Convert this equation from graphing form to standard form: y = -2 ( x + 3 )2 + 3.
[A] y = x2 + 6x + 12 [B] y = -2x2 – 15 [C] y = -2x2 – 12x – 15 [D] y = -2x2 – 12x – 24
2. What value of c would make x2 + 28x + c a perfect square?
3. Change y = x2 – 10x + 32 into graphing form by completing the square.
Day 63: May 10th
Objective: Use graphs to validate algebraic solutions and to approximate solutions when no algebraic method is available, and use two different methods to solve one-variable equations graphically.
• Homework and Classwork Check• 5-13 to 5-14 (pgs 224-225)• Closure
Homework: 5-18 to 5-24 (pgs 226-227)
Homework: Lesson 5.1.1
Calculator Functions
Finding an Intersection:• Press 2nd and TRACE (CALC)• Select 5:interesect• When each direction is satisfied, hit ENTER
Finding an x-intercept:• Press 2nd and TRACE (CALC)• Select 2:zero• When each direction is satisfied, hit ENTER
Calculator & Solving Equations
Method 1:
Enter –
Calculator Function –
2 2Solve: 2 5 3 4 3x x x x
21
22
2 5 3
4 3y x
y x
x
x
CALC: intersect
Intersection
x-coordinates!
3,0
2,16
3x 2x OR
Left Side
Right Side
Calculator & Solving Equations
Method 2:
Solve for 0:
Enter –
Calculator Function –
2 2Solve: 2 5 3 4 3x x x x
21 6y x x
CALC: zero
Solve for 0 then find x-intercept(s)
x-intercepts!2 2
2
2
2
2 5 3 4 3
5 3 4 3
3 3
6 0
x x x x
x x x
x x
x x
2 6 0x x
3 23x 2x OR