alleryIf f(x) = x², then f′(x) is:
Ax
B2x
Cx²
D2x²
Answer & Solution
Correct answer: B. 2x
1. Power rule: d/dx (xⁿ) = n xⁿ⁻¹.
2. For n = 2: d/dx (x²) = 2 x.
_Source: syllabus Maths Ch 13 §13.4 Derivative — Power Rule_
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