Objective- To find the opposite of a sum or difference.

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Presentation transcript:

Objective- To find the opposite of a sum or difference. - ( a + b ) = - a + - b or - a - b - ( a - b ) = - a + b

Simplify. 1) - ( 2x + 5 ) 2) - ( 4a - 7) - 2x - 5 - 4a + 7 3) a (a - 3) - ( 3a - a - 2) 2 2 a - 3a - 3a + a + 2 2 -2a - 2a + 2 4) 4 (x + 5) - (x - 2) - 3 ( x + 1) 4x + 20 - x + 2 - 3x - 3 19

Solve. 13 x - 3( 2 + 4x) = 25 13x - 6 - 12x = 25 + 6 +6 x = 31 + 6 +6 x = 31

Solve. 3( x + 2 ) - ( 5x - 4 ) = - 1 3x + 6 - 5x + 4 = - 1 - 10 -10 - 10 -10 -2x = -11 -2 -2 x = =

Very important when subtracting fractions. Most Missed Problem! 4x 2x + 1 - 5 10 8x 2x + 1 - 10 10 8x - ( 2x + 1 ) 10 8x - 2x - 1 6x - 1 = 10 10

Simplify. - - = 3y 6y - 2 4 3 9y 4 (6y - 2) 12 12 9y - 4 ( 6y -2 ) 12

Simplify. - - = x - y - 5(x + 2y) 8 6 -20(x + 2y) 3 (x - y) 24 24