 Changing the subject of a formula | Improve Tuition | Tutors | Tuition | Tutoring | Tutor

Unit 1 | Algebra

Unit 2 |Graphs

Page 1 | Straight line graphs

Unit 3 |Geometry and Measure

Page 2 | Symmetry

Page 3 | Coordinates

Page 4 | Perimeter, Area, Volume

Page 5 | Circle geometry

Page 6 | Measurement

Page 7 | Trigonometry

Page 8 | Pythagoras

Page 9 | Angles

Page 10 | Shapes

Page 11| Time

Page 12 | Locus

Unit 4 | Numbers

Page 1 | Speed, Distance and time

Page 2 | Rounding and estimating

Page 3 | Ratio and proportion

Page 4 | Factors, Multiples and primes

Page 5 | Powers and roots

Page 6 | Decimals

Page 7 | Positive and negative numbers

Page 8 | Basic operations

Page 9 | Fractions

Page 10 | Percentages

Unit 5 | Statistics and Probability

Page 1 | Sampling data (MA)

Page 2 | Recording and representing data

Page 3 | Mean median range and mode

Page 4 | Standard deviation

Unit 4 | Calculus

Changing the subject of a formula

L.O To be able to rearrange equations to change the subject using the inverse methods used in linear equations.

In linear equations we solved the problem by working out the value of the term exactly in the problem. However sometimes you may not be able to work out the exact value but instead find the value in terms of another algebraic expression for example:  The “subject of a formula” is what the formula is in terms of, with this term appearing on the left hand side of the equation.      Example 1:  Example 2 :  Example 3 :   Example 4 :    Example 5 :    Word Problems

a) Gravitational field strength is denoted by the energy plus three times the field strength divided by 2. However NASA want to work out the field strength on Friendo, Theus and Germus, three theoretical planets.       b) Greg is re-carpeting some of the university rooms. The spare room is rectangular shaped and has a widths of 15.5m. He gets a discount which is the same as square rooting the area of the room. The total coast of carpet was £18 costing £4.50 per square metre Work out the length of the room.         c) Eleanor has a set of 2 cone shaped lava lamps for her bedroom. She has to buy some synthetic liquid to fill them up. The widths of each lava lamp are 5 cm but the heights are different. The larger lamp is 2 times the height of the smaller one. If the small lava lamp requires 14 litres of fluid, how many litres will she need for the larger one? ( 2 d.p accuracy)           D) Salma draws a cross section of her rose patch in her garden. She simplifies and draws it in the form of a right angled triangle with a semicircle underneath covering the full width. She realises that the areas of both parts of the flower patch are the same. If this is true write a formula expressing the height of the triangle “a” in terms of the full rose patch.       #### Previous      2 3 4 5 9     Next

“No act of kindness, However small,
Is ever wasted.” Aesop ++44 (0)1924 506010