How would I go about this type of question?
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You gotta know the unit circle to get exact value and the order of operations to know where to start go from there.
First start in bracket, x = -30 so (-30+75) = 45 degrees
Second multiply this number by 3 (I'm assuming you meant multiplied by 3 and not raised to the third power), 3(45) = 135 degrees
Third take the tangent of 135 degrees, remember tan is sin/cos, so tan(135) = -1 (you lucked out here to get a whole number so calculator would of worked)
Fourth multiply answer by 8, 8(-1) = -8
Fifth subtract -3, -8-3 = -11
First start in bracket, x = -30 so (-30+75) = 45 degrees
Second multiply this number by 3 (I'm assuming you meant multiplied by 3 and not raised to the third power), 3(45) = 135 degrees
Third take the tangent of 135 degrees, remember tan is sin/cos, so tan(135) = -1 (you lucked out here to get a whole number so calculator would of worked)
Fourth multiply answer by 8, 8(-1) = -8
Fifth subtract -3, -8-3 = -11