A curve represents the thermal expansion of a composite alloy, where the length LLL is defined as a function of the temperature θ\thetaθ such that L=f(θ)L = f(\theta)L=f(θ). It is observed that the graph has a point of inflection at θ=185\theta = 185θ=185. Given that f′(185)=αf'(185) = \alphaf′(185)=α and f′′(185)=βf''(185) = \betaf′′(185)=β, where α\alphaα and β\betaβ are constants, identify which of the following statements must be true:
f′(185)=0f'(185) = 0f′(185)=0 f′′(185)=0f''(185) = 0f′′(185)=0 f′(185)≠0f'(185) \neq 0f′(185)=0 f′′(185)<0f''(185) < 0f′′(185)<0
Practise Edexcel A Level Maths 9.9 Using Second Derivatives with exam-style questions for A Level Maths. 57 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.