Edexcel AS Pure Maths Questions with 100% Correct Answers

Edexcel AS Pure Maths Questions with 100% Correct Answers Quadratic Formula - ANSWER Discriminant - ANSWER b² - 4ac > 0 then two distinct real roots. b² - 4ac = 0 then one repeated real root. b² - 4ac < 0 then a quadratic function has no real roots. Types of Lines for Regions - ANSWER If y < f(x) or y > f(x) then the curve y = f(x) is not included in the region, and is represented by a dotted line. If y ≤ f(x) or y ≥ f(x) then the curve y = f(x) is included in the region, and is represented by a solid line. Graph Translations - ANSWER y = f(x) + a is a translation of the graph y = f(x) by a upwards. y = f(x + a) is a translation of the graph y = f(x) by a to the left. Graph Stretches - ANSWER y = af(x) is a stretch of the graph y = f(x) by a scale factor of a in the vertical direction. y = f(ax) is a stretch of the graph y = f(x) by a scale factor of 1/a in the horizontal direction.