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Pre-Calculus

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Find the inverse of the following quadratic equation. Hint: Complete the square first.

y= 2x²+16x-5

  • Pre-Calculus -

    y = 2(x^2 + 8x +16-16) - 5
    = 2( (x+4)^2 - 16) - 5

    y = 2(x+4)^2 - 37

    then the inverse is
    x = 2(y+4)^2 - 37

  • Pre-Calculus -

    so, does f(f-1(x)) = x?

  • Pre-Calculus -

    can someone please help me A
    16

    ft
    ladder leans against the side of a house. The bottom of the ladder is
    9

    ft
    away from the side of the house. Find
    x
    , the angle of elevation of the ladder. Round your answer to the nearest tenth of a degree.


    x
    169

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