The equation of tangent line to the curve y = x² at (2, 4) is?
- 4x - y = 4
- 4x - 2y = 5
- 4x - 2y = 4
- None of these
Explanation
The derivative of y = x² is dy/dx = 2x.
At x = 2, the slope is 2(2) = 4.
The tangent line equation is y - 4 = 4(x - 2), which simplifies to y = 4x - 4, or 4x - y = 4.
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