Real life situations can be represented by algebraic expressions and formula. We can then use these to solve problems such as working out costs, timings, quantities etc. If the length had been given ...

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 ...