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Answer 1

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a) (9y-5x) +(2y-3x-4) -12y +6 =9y -5x +2y -3x -4 -12y +6 = -y -5x-3x -4 +6 = -y -8x -4+6 = -y -8x +2 = -8x -y +2

 

b) -(3-4x-5y) - (-3x+6y+7) =-3 +4x +5y +3x -6y -7 = -10 +4x +5y +3x -6y = -10 +7x +5y-6y = -10 +7x -y = 7x -y -10

 

c) 8x -(10x+6y-5) -(-5y+8x-2) =8x-10x -6y +5 +5y -8x +2 = -10x -6y +5 +5y +2 = -10x -y +5+2 = -10x -y +7

 

d) 2(3a-4b) -5(2a+b) =6a -8b -10a -5b = -4a -8b-5b = -4a -13b

 

e) -5(2x+2y-6z) -(x-7y-3z) = -10x -10y +30z -x +7y +3z = -11x -10y +30z +7y +3z = -11x -3y +30z +3z = -11x -3y +33z

 

f) 2(-3a-4b) -3(a+2b) +4(2a-3b) =-6a -8b -3a -6b +8a -12b = -a -8b-6b-12b = -a -26b

 

g) (x+2)(x-4) = -4x+2x -8 = -2x -8

 

h) 2(3x-2y) -(2x+y)(5x-4y) = 6x -4y -( -6xy +5xy ) = 6x -4y +6xy-5xy = 6x -4y +xy

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a)

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