How do I solve a cubic?
You can solve a cubic by applying factor theorem. This is where you plug different values for x into your cubic f(x) = ax^3 + bx^2 + cx + d such that x is a factor of d, until you find a value t for which f(t) = 0. From here factorise the cubic and solve the remaining quadratic equation by the same method, by factorisation, completing the square or by the quadratic formula.
HW
Related Maths A Level answers
All answers ▸differentiate y = 4x^3(12e^-4x) with respect to x
I don't understand chain rule for differentiation especially when combined with more complex functions.
What is an improper fraction, and how to I make thisproper so that it can be differentiated?
The points A and B have coordinates (3, 4) and (7, 6) respectively. The straight line l passes through A and is perpendicular to AB. Find an equation for l, giving your answer in the form ax + by + c = 0, where a, b and c are integers.