alleryThe range of the function $f(x)=x^2,\; x\in\mathbb{R}$ is:
A$(0,\infty)$
B$(-\infty,0]$
C$\mathbb{R}$
D$[0,\infty)$
Answer & Solution
Correct answer: D. $[0,\infty)$
x² ≥ 0 for all real x, so the range is [0, ∞).
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