PreCalc
posted by Maddy .
How would I solve:
X^(4/3)+X^(2/3)=28

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solve x^(4/3)+x^(2/3)=28
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let x^(2/3) = y
then we have
y^2 + y  28 = 0
y = (1 ± √113)/2
so x^(2/3) = (1+√113)/2
x = [(1 + √113)/2]^(3/2) = appr. 10.566
or x^(2/3) = (1  √113)/2 , which has no solution
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