Physics - test question verification

Forces of 2.4 N and 1.8 N act on an object at right angles to one another. What is the magnitude of a third force acting on the same object so that it remains stationary?
A) 3.0 N
B) 4.2 N
C) 0.6 N

I don't understand how the answer is A)

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  1. equilibrant=-sqrt(2.4^2+1.8^2)

    but if you have a keen eye, you recognize this as a 3,4,5 triangle, so the equilibrant is 30 (5*6), legs of triangle are 3*6, 4*6

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  2. oops, 3.0

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