Rearrange the formula to make r the subject Watch
- Thread Starter
- 06-10-2016 11:52
- 06-10-2016 11:54
- 06-10-2016 11:56
Subtract 4 from both sidesA - 4 = r2
Square root both sides
√ (A-4) = r (Make sure the square root extends over the whole of A-4)
Last edited by AlexFam; 06-10-2016 at 12:00.
- 06-10-2016 11:57
- 06-10-2016 11:59
If you do an operation on one side of an equation, that equation can only hold if the same operation occurs on the other. You need to 1. get an equation in terms of everything not r on one side, and everything r on the other, 2. reduce the equation to r= (something without r).