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9 September, 10:27

Solve 4 sec sqrd x = 8

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  1. 9 September, 13:42
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    4 sec² (x) = 8

    Divide each side by 4: sec² (x) = 2

    Take the square root of each side: sec (x) = + or - √2

    We know that sec (x) = 1/cos (x)

    So the equation becomes 1/cos (x) = + or - √2

    Divide '1' by each side: cos (x) = + or - (1/2) √2

    x = 45°, 135°, 225°, 315°
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