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2014-08-19T15:44:06+05:30

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Torque is a vector quantity.  I assume r is in meters. it is not specified.

Torque = r x F        is the cross product of Force and distance between the force and the axis about which the torque is found.

So torque is = ( - 5 i - 4 j) x (4 i - 10 j )
             = -5 * 4 i x i + 5 * 10 i x j - 4 * 4 j x i  + 4 * 10 j x j
             = 0 + 50 k + 16 k + 0
             =  66 newton-m
the direction is in the +ve z axis and  magnitude is 66 newton-metres

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