Results 1 to 4 of 4

Math Help - Changing subject of formula

  1. #1
    Member
    Joined
    Mar 2009
    Posts
    97

    Changing subject of formula

    Hello
    When changing the subject of a formula with roots and exponenets is the order of operations as follows?

    add/subtract
    divide/multiply
    roots
    powers

    thanks in advance
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Air
    Air is offline
    Junior Member Air's Avatar
    Joined
    Aug 2008
    Posts
    47
    Awards
    1
    Quote Originally Posted by 200001 View Post
    Hello
    When changing the subject of a formula with roots and exponenets is the order of operations as follows?

    add/subtract
    divide/multiply
    roots
    powers

    thanks in advance
    BODMAS: Brackets, Others (E.G. Indices, Square Root), Division, Multiplication, Addition, Subtraction.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor

    Joined
    Apr 2005
    Posts
    15,373
    Thanks
    1316
    That is the "order of operations" when you are performing a calculation.

    When you are solving an equation, you have to remember that you are "backing" out so everything runs in reverse.

    For example, if y=\frac{2x-1}{3} and had to calculate y for a given value of x (you know x and want to find y), you would use "BODMAS" or "PEMDAS" (P for parentheses instead of B for brackets- which you can remember as "Please excuse my dear aunt Sally"). Since the "vinculum" (the line between numerator and denominator) counts as a "bracket" or "parentheses" you first MULTIPLY 2 by x, the SUBTRACT 1, finally DIVIDE by 3.

    But when you want to solve the equation- you know y and want to find x, just the opposite of the above- you do the opposite; the opposite of each operation in the opposite order. First you MULTIPLY both sides of the equation by 3 then ADD 1 to both sides, finally DIVIDE both sides by 2.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Member
    Joined
    Mar 2009
    Posts
    97
    Thanks to both of you for the responses
    I shall have a try
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Changing the subject of a formula
    Posted in the Algebra Forum
    Replies: 7
    Last Post: September 13th 2010, 03:52 AM
  2. Changing the subject of the formula
    Posted in the Algebra Forum
    Replies: 1
    Last Post: May 19th 2009, 05:57 AM
  3. Changing the subject of the formula
    Posted in the Algebra Forum
    Replies: 1
    Last Post: March 23rd 2009, 06:14 AM
  4. changing the subject of a formula?
    Posted in the Algebra Forum
    Replies: 1
    Last Post: January 10th 2009, 08:49 AM
  5. changing the subject of a formula
    Posted in the Algebra Forum
    Replies: 3
    Last Post: April 15th 2007, 10:00 AM

Search Tags


/mathhelpforum @mathhelpforum