Maths (school) · Part 03
Equations and formulae
Solving equations, inequalities and quadratics, and rearranging formulae.
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- Solving linear equationsFinding the value of the unknown letter by doing the same thing to both sides until the letter is alone.
- Unknowns on both sidesWhen the letter appears on both sides, first move the letter terms to one side, then solve as normal.
- Changing the subjectRearranging a formula so a different letter stands on its own on one side.
- InequalitiesStatements using <, >, or the signs for 'less than or equal' and 'more than or equal' that show a range of possible values.
- Simultaneous equationsTwo equations with two unknowns that are both true at once. You find the pair of values that fits both.
- Solving quadratics by factorisingWriting the quadratic as two brackets equal to zero, then setting each bracket to zero to find the solutions.
- The quadratic formulaA formula that solves any quadratic ax^2 + bx + c = 0, even when it does not factorise easily.
- Forming equationsTurning a worded problem into an equation by letting a letter stand for the unknown.