Question 72747
{{{sqrt(x^3) = 8}}}
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If you square both sides of this equation you get:
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{{{x^3 = 64}}}
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From this you can ask yourself, "What number cubed equals 64?"  Hint: try +4. Minus 4 
will not work because -4 cubed is -64.
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Hope this problem shows you that a common way to get rid of a square root is to get it
by itself on one side of an equation and then square both sides of the equation.