Maths, Physics Revision Physicss Maths Physics Physics A Level Physics Home Maths Maths Revision hut Rearranging equations Gathering terms 2a + 3ab – b2 +3a – ab +a ‘b2’term ‘ab’ term ‘ab’ term ‘a’ term ‘a’ term ‘a’ term You can add or subtract like terms only  You cannot mix terms So the above equation can be simplified to 2a + 3a + a = 6a,      3ab – ab = 2ab ,  b2 is on it’s own 6a + 2ab - b2 Further example  3a +2b + c + 4a - b +c 3a +4a = 7a 2b - b = b c + c = 2c So the simplified equation is 7a + b +2c You can also do this by eliminating numbers from each side either by adding, subtracting, multiplying or dividing 3x -1 = x + 7 Add 1 to each side 3x -1 + 1 = x + 7 + 1 We then get 3x = x + 8 Now subtract x from each side 3x - x = x + 8 - x We now get 2x = 8 divide both side by 2 2x/2 = 8/2 Final answer      x = 4 Gathering terms Click here for top Algebra