Removing brackets is to multiply the term outside the brackets by each term inside - also known as the distributive law. Use FOIL to remove a pair of brackets then simplify by collecting like terms.

For ax 2 + bx + c = 0, (α, β) = [–b ± √(b 2 – 4ac)]/2ac, where α and β are the roots of the equation. Sum of roots = –b/a Product of roots = c/a If roots of a quadratic equation are given, then the ...

Find your added subjects in My Bitesize. Try this quiz based on GCSE Maths past papers. Choose the topic you would like to revise and answer the questions. GCSE Maths: exam-style questions Free ...