College Algebra

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Graph the following function using transformations. Be sure to graph all of the stages on one graph. State the domain and range. y = -SQRT x - 6.
My instructor is saying that I have to do more than one graph. Can anybody help me I am lost!

  • College Algebra -

    I will assume you mean
    y = -√(x-6) and NOT y = -(√x) - 6

    start with y = √x
    using the following points, sketch the graph.
    (0,0), (1,1), (4,2), (9,3), (16,4) ...
    (notice I pick numbers that work out nicely)
    You will have a "swooping" curve in the first quadrant that rises slowly.

    now sketch y = - √x by reflecting your graph in the x-axis, (just flip it downwards)

    then move the second graph 6 units to the RIGHT
    (move each point 6 units to the right)

    domain: any value of x , x ≥ 6
    range: any real value of y , y ≤ 0 (all below the x-axis)

    To verify, enter
    (x-6)^.5
    in the "first graph" in
    http://rechneronline.de/function-graphs/

    change "Range x-axis from" 6 to 20

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