calc

2sec^2x - 3tanx - 5 = 0
I got
x= 1.24 radians
x= 4.38 radians
x= -0.74 radians
x= -3.88 radians

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  1. trying one of them
    my calculator is set for degrees
    using 4.38 rad = 251 degrees
    sec 251 = -3.07
    2 sec^2 251 = 18.87

    tan 251 = 2.9
    -3 tan 251 = -8.71

    18.87 -8.71 - 5 = 5.15

    hmmm :(

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  2. 2sec^2x - 3tanx - 5 = 0
    2 + 2tan^2x - 3tanx - 5 = 0
    2tan^2x - 3tanx - 3 = 0
    tanx = (3±√33)/4 = -0.686, 2.1861
    x = -0.601+nπ, 1.142+nπ
    So, I get
    x = 1.142, 2.541, 4.283, 5.682

    Too bad you didn't show us any of your work.

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