What values of x satisfy the equation x2/3 + x1/3 – 2 ≤ 0 ?	Choose the correct option:
A) – 8 ≤ x ≤ 1	B) – 1 ≤ x ≤ 8	C) 1 ≤ x ≤ 8	D) – 8 ≤ x ≤ 8	E) None of these
Explanation :   Let, x1/3 = y. The equation becomes y2 + y – 2 ≤ 0, or y2 + y ≤ 2.   Now, look at the upper limit. We know that y2 + y ≤ 2.   Among the positive numbers, 1 is the biggest number that satisfies the equation. No number greater than 1 can have y2 + y ≤ 2. So the upper limit is 1.   Maximum value of y is 1, hence maximum value of x1/3 is 1, and hence maximum value of x is 1.   This answer is there only for option 1. Hence that is the answer.   – 8 ≤ x ≤ 1nswer : – 8 ≤ x ≤ 1
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What values of x satisfy the equation x2/3 + x1/3 – 2 ≤ 0 ?