JAMB Mathematics 2025 Objective — Question 20
Question 20 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2025 Objective paper, with the correct answer and a full explanation.
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Find the equation of the tangent to y=x³-2x+1 at x=1.
- A. y=x+1
- B. y=x-1Correct
- C. y=2x-1
- D. y=2x+1
Explanation
dy/dx=3x²-2. At x=1, gradient=1 and y=0. Tangent: y-0=1(x-1) ⇒ y=x-1.
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