The altitude A(t)A(t)A(t) of a research drone relative to its launch platform is modeled by the function A(t)=3t3+pt2+qt−20A(t) = 3t^3 + pt^2 + qt - 20A(t)=3t3+pt2+qt−20 for t≥0t \ge 0t≥0, where ppp and qqq are constants.
Given that (3t−2)(3t - 2)(3t−2) is a factor of A(t)A(t)A(t), show that 2p+3q=862p + 3q = 862p+3q=86.
Given further that when A(t)A(t)A(t) is divided by (t+1)(t + 1)(t+1), the remainder is q−36q - 36q−36, find the value of ppp and the value of qqq.
Hence, using algebra, fully factorise A(t)A(t)A(t).
Practise AQA A Level Maths 1.5 B: Algebra and functions with exam-style questions for A Level Maths. 358 questions covering 1.5.1 Laws of indices, 1.5.2 Surds, 1.5.3 Quadratic functions, 1.5.4 Simultaneous equations, 1.5.5 Linear and quadratic inequalities, 1.5.6 Polynomials and rational expressions, 1.5.7 Graphs of functions and proportion, 1.5.8 Composite and inverse functions (A-level only), 1.5.9 Transformations of graphs, 1.5.10 Partial fractions (A-level only), and 1.5.11 Functions in modelling (A-level only), matched to the AQA A Level Maths (7357) 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.
