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9.8 Implicit Differentiation

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Question 16

The relationship between the pressure ppp and temperature ttt of a specific gas model is described by the equation

p3t+2pt3=12 p^3t + 2pt^3 = 12 p3t+2pt3=12
a.

Prove that the curve representing this relationship does not intersect the coordinate axes in the ppp-ttt plane.

[2]
bi.

Show that

dtdp=−3p2t+2t3p3+6pt2 \frac{dt}{dp} = -\frac{3p^2t + 2t^3}{p^3 + 6pt^2} dpdt​=−p3+6pt23p2t+2t3​
[3]
bii.

Prove that the model has no stationary points.

[3]
biii.

In the case when p>0p > 0p>0, find the equation of the tangent line to the curve at the point where t=1t = 1t=1. Give your answer in the form at+bp=cat + bp = cat+bp=c, where a,b,ca, b, ca,b,c are integers.

[4]

9.8 Implicit Differentiation Questions

  1. A Level
  2. /Maths
  3. /9.8 Implicit Differentiation

Practise Edexcel A Level Maths 9.8 Implicit Differentiation with exam-style questions for A Level Maths. 48 questions, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank

Algebraic Methods
Functions and Graphs
Sequences and Series
Binomial Expansion
Radians
Trigonometric Functions
Trigonometry and Modelling
Parametric Equations
Differentiation
Numerical Methods
Integration
Vectors