Find the value of (x) ?
0 = (300,000x / (16 + x^2) ^0.5) - 200,000
0 = (300,000x / (16 + x^2) ^0.5) - 200,000
200,000 = (300,000x / (16 + x^2) ^0.5)
√(16 + x^2) = 300,000x/200,000
√(16 + x^2) = 3x/2
square both sides
16 + x^2 = 9x^2/4
64 + 4x^2 = 9x^2
5x^2 = 64
x^2 = 64/5
x = ± 8/√5 or ± 8√5/5