how do you solve (25^-1/2-100^-1/2)^-1

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25^-(1/2)=1/25^(1/2)=1/sqrt(25)=1/5; 100^-(1/2)=1/10. So we have (1/5-1/10)^-1=(2/10-1/10)^-1=(1/10)^-1=10/1=10.
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