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# Module 19

### Quadratic Functions and their Graphs

Question | Answer |
---|---|

If a>0, the graph of the quadratic function opens which way? | Upward |

If a<0, the graph of the quadratic function opens which way? | Downward |

The vertex of a parabola defined by f(x)=a(x-h)^2+k has a vertex defined by the values of which variables? | (h,k) |

What is the vertex of the quadratic function g(x)= (x-4)^2-2? | (4,2) |

What is the vertex of the quadratic function f(x)= 3(x-8)+6? | (8,6) |

In the equation f(x)=(x-2)+6, is h positive or negative? | Positive |

In the equation f(x)=(x+9)+3, is h positive or negative? | Negative |

In graphs with the equation f(x)=x^2+k, what happens to the graph when k is negative? | The graph will shift |k| downward from y=x^2 |

In graphs with the equation f(x)=x^2+k, what happens to the graph when k is positive? | The graph will shift |k| upward from y=x^2 |

In graphs with the equation f(x)=(x-h)^2, what happens to the graph when h is positive? | The graph will shift h units to the right from y=x^2 |

In graphs with the equation f(x)=(x-h)^2, what happens to the graph when h is negative? | The graph will shift h units to the left from y=x^2 |

What is another name for the vertex (h,0)? | The x-intercept |

What is another name for the vertex (0,k)? | The y-intercept |

In a parabola defined by f(x)=a(x-h)^2+k, when the absolute value of a is greater than 1, how does the graph compare to the graph of y=x^2? | The graph is narrower than y=x^2 |

In a parabola defined by f(x)=a(x-h)^2+k, when the absolute value of a is less than 1, how does the graph compare to the graph of y=x^2? | The graph is wider than y=x^2 |

How do you determine a parabola's axis of symmetry? | The axis of symmetry is the same as the value of h; if h=4, then the axis of symmetry is x=4 |

For f(x)=x^2+2, state the vertex, axis of symmetry, and whether the parabola opens upward or downward. | (0,2), x=0, downward |

The graph of f(x)=ax^2+bx+c when a is not 0 is a parabola with a vertex of what? | (-b/2a, f(-b/2a)) |

How do you solve an equation by completing the square? | Add the square of half the coefficient of x, and then use the square root property to get two solutions. |

Make a perfect square trinomial from x^2+12x | x^2+12x+36 |

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