Quadratic Inequalities What affects the inequality sign when rearranging a quadratic inequality? The inequality sign is unchanged by... Adding/subtracting a term to both sides Multiplying/dividing ...
Solving Quadratics Equations How do I decide the best method to solve a quadratic equation? How do I solve a quadratic equation by the quadratic formula? How do I solve a quadratic equation by fact...
Factorising Quadratics Why is factorising quadratics useful? Factorising gives roots (zeroes or solutions) of a quadratic It gives the x-intercepts when drawing the graph How do I factorise a monic...
Quadratic Functions & Graphs What are the key features of quadratic graphs? If a is positive then the vertex is the minimum point If a is negative then the vertex is the maximum point Wh...
How do I find the gradient of a straight line? Find two points that the line passes through with coordinates (x1, y1) and (x2, y2) The gradient between these two points is calculated by This is giv...
Binomial Theorem What is the Binomial Theorem? The binomial theorem (sometimes known as the binomial expansion) gives a method for expanding a two-term expression in a bracket raised to a power A b...
Edexcel IGCSE Chemistry 复习笔记 4.3.2 Halogens & Alkanes Halogens & Alkanes In a substitution reaction, one atom is swapped with another atom Alkanes undergo a substitution reaction...
Language of Proof What is proof? Proof is a series of logical steps which show a result is true for all specified numbers ‘Seeing’ that a result works for a few numbers is not enough to show that ...
Edexcel IGCSE Chemistry 复习笔记 4.3.1 Alkanes The Alkanes Alkanes are a group of saturated hydrocarbons The term saturated means that they only have single carbon-carbon bonds, there are no...
