Question 90170
{{{(x^-2)}}} = 4 [write (4) as a number with an exponent]

{{{(x^-2)}}} = {{{(2^2)}}} [re-write (2^2) with a negative exponent by taking the reciprocal of (2)]
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{{{(x^-2)}}} = {{{(1/2)^-2}}}
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.Therefore, x=1/2