115-0301-Invisible.pdf

# 115-0301-Invisible.pdf - Invisible Parenthesis You often...

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Invisible Parenthesis You often have to supply the parenthesis to compute the expressions correctly. Example 1 Expand and combine like terms: 5 x ° (2 x + 1) (3 x ° 4) Solution) (WRONG) 5 x ° (2 x + 1) (3 x ° 4) = 5 x ° 6 x 2 ° 8 x + 3 x ° 4 = ° 6 x 2 ° 4 The expression (2 x + 1) (3 x ° 4) is grouped. After you FOIL, you must supply the parenthesis around 6 x 2 ° 8 x + 3 x ° 4 . Solution) (CORRECT) 5 x ° (2 x + 1) (3 x ° 4) = 5 x ° ° 6 x 2 ° 8 x + 3 x ° 4 ± = 5 x ° 6 x 2 + 8 x ° 3 x + 4 = ° 6 x 2 + 10 x + 4 Example 2 When A = 3 x + 4 and B = 2 x ° 7 , °nd A ° B . Solution) (WRONG) A ° B = 3 x + 4 ° 2 x ° 7 = x ° 3 The expression
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