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Differentiation

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Question 474

The population NNN of a specific bacteria culture, in thousands, is modeled by the equation

N(t)=(2t+2)28+122t+23 N(t) = \frac{(2t+2)^2}{8} + 12\sqrt[3]{2t+2} N(t)=8(2t+2)2​+1232t+2​

for t≥0t \ge 0t≥0, where ttt is the time in hours since the start of an experiment.

a.

Find an expression for dNdt\frac{dN}{dt}dtdN​.

[3]
b.

The point PPP with coordinates (3,32)(3, 32)(3,32) lies on the graph of the population model. Find an equation of the tangent to the curve at the point PPP.

[4]
c.

Show that the model predicts no stationary points for the population for t≥0t \ge 0t≥0.

[2]
Markscheme

Differentiation Questions

  1. A Level
  2. /Maths
  3. /Differentiation

717 exam-style questions on Edexcel A Level Maths Differentiation, covering 9.1 Differentiating sin x and cos x, 9.2 Differentiating exponentials and logarithms, 9.3 The Chain Rule, 9.4 The Product Rule, 9.5 The Quotient Rule, 9.6 Differentiating Trigonometric Functions, 9.7 Parametric Differentiation, 9.8 Implicit Differentiation, 9.9 Using Second Derivatives, and 9.10 Rates of Change. Each one has a worked solution and a mark scheme showing where the marks go.

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