A-Level Maths
Differentiate y = (3x^2 + 4)(x - 1) and simplify the result.
A strong revision platform should help you choose the product rule or expansion first, then show the method clearly. Expanding gives y = 3x^3 - 3x^2 + 4x - 4, so dy/dx = 9x^2 - 6x + 4.