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NECO 2023 · Paper 1 · Q37

Find the gradient of the curve y=2x2+5x−1y = 2x^2 + 5x - 1 at the point x=4x = 4.

Worked solution (try it first)
  1. The gradient is dydx=4x+5\frac{dy}{dx} = 4x + 5.
  2. At x=4x = 4: 16+5=2116 + 5 = 21, option E.

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