A curve C C\,C has equation y=3x2+1y = 3x^2 + 1y=3x2+1
The point P(3,28)P(3, 28)P(3,28) lies on CCC.
Find the gradient of the tangent to C C\,C at PPP.
The point Q Q\,Q with xxx-coordinate 3+h3 + h3+h also lies on CCC. Find the gradient of the chord PQPQPQ, giving your answer in terms of h h\,h in its simplest form.
Explain briefly the relationship between your answers to parts (b) and (a).
375 exam-style questions on AQA A Level Maths 1.10 G: Differentiation, covering 1.10.1 The derivative and second derivative, 1.10.2 Differentiating standard functions, 1.10.3 Applications of differentiation, 1.10.4 Product, quotient and chain rules (A-level only), 1.10.5 Implicit and parametric differentiation (A-level only), and 1.10.6 Constructing differential equations (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.