Multiplier xts (-1)

Multiply (sqrt(-1)+sqrt(-1))(a-bsqrt(-1))

Multiply by

Multiply : (-124) xx (-1)

Multiply : 13times1/3

Let 's multiply (-1) xx (-1)

Multiply : (ab - 1)(3-2ab)

When does a machine act as (a) a force multiplier, (b) a speed multiplier. Can a machine act as a force multiplier and a speed multiplier simultaneously ?

A machine works as a (i) force multiplier, (ii) speed multiplier. In each case state whether the velocity ratio is more than or less than 1.