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As there are no parentheses then the expression stated can be simplified as follows :-
7x - 4x - 9 = 3x - 9
If the parentheses were placed (7x - 4x) - 9 then the result would be the same.
If the parentheses were placed 7x - (4x - 9) = 7x - 4x + 9 = 3x + 9.
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What must you do if you remove parentheses preceded by a plus sign?
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you turn everything inside the prenthises positive or negative
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Cause it is
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Without parentheses, 3 x 4 = 12 2x + 12 factors to 2(x + 6)
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The sequence mathematicians have agreed to follow to simplify expressions?
parentheses exponents multiplication & division addition & subtration remember by using the following: Please Excuse My Dear Aunt Sally
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