Formulae: Unit 17 4.0 / 5 based on 1 rating ? MathematicsMore AlgebraGCSEEdexcel Created by: annanolanCreated on: 02-01-17 10:22 What do you do when the letter to be made the subject appears twice in the formula? Get them both on the same side then factorise 1 of 7 How do you rationalise the fraction 1 / a√b Multiply by √b / √b 2 of 7 How do you rationalise the fraction 1 / a∓√b Multiply by a±√b / a±√b 3 of 7 What is a function? A rule for working out values of y for given values of x 4 of 7 How do you work out fg(x)? First work out g(x) then substitute your answer into f(x) 5 of 7 What is the inverse function? It reverses the effect of the original function 6 of 7 What is the inverse of f(x) f^-1(x) 7 of 7
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