1/(X^-2Y)-1(XY^-2)=____

XY

(square root of 84 - square root of 5.25)

I don't understand the first equation.

sqrt(84)=sqrt(4*21)=sqrt(16*5.25)=4sqrt(5.25)

so
sqrt(84)-sqrt(5.25)=

4sqrt(5.25)-sqrt(5.25)=3sqrt(5.25)

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