Arturo O. answered 01/23/20
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Start with the substitution
y = x1/5
Then
8y2 + 24y + 18 = 2(4y2 + 12y + 9) = 2(2y + 3)2
Finally,
8x2/5 + 24x1/5 + 18 = 2(2x1/5 + 3)2