Use the given information to work out something that is outside the range of the data. Always risky to do, as there is no certainty in the answer.

# Category Archives: E

# Enlarge

Multiply the length of all the sides by the same amount. It could mean make smaller if the scale factor is between 0 and 1.

# Express, in terms of

Use the information in the question to write an expression with the letter(s) given.

# Expand and simplify

Usually given in questions where there are more than one set of brackets. Expand the brackets and collect any like terms.

# Expand

Multiply out the brackets.

# Equation

An algebraic rule that links two variables.

Example: y = 2x – This means that y is always double the x value.

π Key Equation Topics: Solving Equations, Solving Equations with Letters on Both Sides, Equations involving Fractions, Forming and Solving Equations

πAlso Look Up: Graph, Inequality, Linear Equation

# Exterior Angle

An angle outside of the shape made by continuing one of the sides.

Example: Calculate the exterior angle of a 10 sided regular polygon.Β

π Key Exterior Angle Topics: Interior and Exterior Angles

# Expression

An algebraic statement that has no equals sign.

Example: 2a + 6

π Key Expression Topics: Collecting Like Terms, Expanding Brackets, Factorising, Forming Expressions

# Express

Write down. Usually used where the question wants the answer in a particular format.

Example: Express your answer in the format p + βqΒ

π Key Express Topics: Surds

# Explain

Write a sentence to show how you got to your answer. You can use calculations to prove your point.

Example: Explain why this is wrong.Β

π Key Explain Topics: Angles on Parallel Lines, Circle Theorems, Proof