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1. When you solve a quadratic equation, you are finding the _______________________ of the graph. 2. Solve this equation by graphing on your calculator: y x 2 7 x 10 First x-intercept: ____________ a. b. c. d. e. f. g. h. i. j. k. l. 3. Second x-intercept: ____________ Step 1: Clear your screen Step 2: Hit the ‘Y=’ button Step 3: Enter your equation into the first spot Step 4: Hit the ‘GRAPH’ button Step 5: Hit ‘2ND’ ‘CALC’ Step 6: Choose the ‘zero’ option (option 2 on most calculators) Step 7: Your screen should say “Left Bound?” Pick one of your x-intercepts. Move the cursor so that it is to the left of the x-intercept. Hit ‘ENTER’ Step 8: Your screen should say “Right Bound?” Move the cursor so that it is to the right of the same x-intercept from step 6. Hit ‘ENTER’ Step 9: Your screen should say “Guess?” Don’t change anything; just hit ‘ENTER’. This should give you the value for your first x-intercept!! Step 10: Hit ‘2ND’ ‘CALC’ again. Step 11: Choose the ‘zero’ option Step 12: Repeat steps 7 – 9 for your second x-intercept y 3x 2 2 x 8 a. Without graphing it, tell me: does this graph open up or down? b. Is the vertex of this graph a maximum or a minimum value? c. Solve this equation using your graphing calculator: First x-intercept: __________________ Second x-intercept: _______________ 4. y 4 x 2 16 a. Without graphing it, tell me: does this graph open up or down? b. Is the vertex of this graph a maximum or a minimum value? c. Solve this equation using your graphing calculator. First x-intercept: ___________________ 5. Solve the following quadratic equations algebraically: a. y 4 x 2 16 b. y ( x 3) 2 16 Second x-intercept: ________________ c. 20 ( x 4) 2 5