This model can be used to predict the fuel consumption of a car, y y\,y miles per gallon, for a car travelling at x x\,x miles per hour.
y=55−0.015(x−50)2 y = 55 - 0.015(x - 50)^2 y=55−0.015(x−50)2Calculate the fuel consumption, in miles per gallon, of a car travelling at 70 miles per hour.
Deduce the speed at which the car has the greatest fuel efficiency.
State, giving reasons, the limitation on the values of xxx
Practise Edexcel A Level Maths Quadratics with exam-style questions for A Level Maths. 25 questions covering 2.1 Solving Quadratics, 2.2 Completing the Square, 2.3 Sketching Quadratic Graphs, 2.4 The Discriminant, and 2.5 Modelling with Quadratics, 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.
