How do i solve x (2 + 5) = (5 x 2) + (5 x 5) ?

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  • Philip
    Lv 6
    1 month ago

    x(2+5) = (5 x 2) + (5 x 5)...(1);

    Michell, your notation forces the reader to guess what you mean;

    Case 1: (5 x 2) means 5x^2 and (5 x 5) means 5x5;

    Then (1) means 7x = 5x^2 + 5x^5, ie., 7x = (5x^2)(1+ x^3);

    Case 2: (5 x 2) means (5*2) and (5 x 5) means (5*5);

    Then (1) means 7x = (5*2) + (5*5) = 5(2+5) = 7*5;

    Summary: Use (^) to denote ''raised to the power'' as in 2^3 = 8;

    .................Use (*)  to denote ''times'' as in 7*9 = 63;

    If you wished to remove any possibility of ambiguity, you would have written either;

    7x = 5x^2 + 25 or 7x = (5*2) + (5*5);

    Formats such as (5 x 2) and (5 x 5) are meaningless. 

  • 1 month ago

    Remember themaths rule ; 'Do inside the brackets first'. 

    x(7)  = (10) + (25)

    Remove the brackets 

    7x = 10 + 25 

    Add the terms 

    7x = 35 

    Divide both sides by '7' 

    7x/7 = 35/7 

    x = 5 

  • 1 month ago

     x (2 + 5) = (5 x 2) + (5 x 5) 

     x = 5

  • 1 month ago

    x (2 + 5) = (5 x 2) + (5 x 5)

    x(7) = 10 + 25

    7x = 35

    7x/7 = 35/7

    x = 5

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  • Ian H
    Lv 7
    1 month ago

    To avoid confusion it would be best to write this as

    x*(2 + 5) = (5 * 2) + (5 * 5)

    7x = 10 + 25 = 35

    x = 5

  • 1 month ago

    Does the first “x” mean something different than the “x” between the 5 and the 2? Please use “*” for multiplication.

  • 1 month ago

    x(2 + 5) = (5 x 2) + (5 x 5)

    7x = 10 + 25 

    7x = 35

    (7x/7) = 35/7

    x = 5 ©

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