clear parentheses and combine like terms

Mathematics
Tutor: None Selected Time limit: 1 Day

exercise1.  5(T - 6) + 2     exercise2.   -3(2x + 1) -13   exercise3.  4+6(y - 3) exercise4. 21 - 7(3 - Q) 

exercise5. - 3 - (2n + 1)   exercise6. -2 (a + 3b) - (4a -5b)   exercse7. 10(x +5) - 3(2x + 9)

exercise8.  -(12z + 1) + 2(7z - 5) 

Oct 9th, 2014

exercise1.  5(T - 6) + 2 = 5T-5*6+2 = 5T- 30+2 = 5T-28

   exercise2.   -3(2x + 1) -13 = -3*2x +1(-3) -13 = -6x - 3 - 13 = - 6x -16 

exercise3.  4+6(y - 3) = 4+6*y-3*6 = 4+ 6y -18 = 6y -14

exercise4. 21 - 7(3 - Q) =21 -7*3-Q(-7) = 21 -21 + 7Q = 7Q

exercise5. - 3 - (2n + 1)   = -3 -2n -1 = -2n -4

exercise6. -2 (a + 3b) - (4a -5b)   = -2*a +3b(-2) -4a+5b = -2a-6b-4a+5b = -6a -b

exercse7. 10(x +5) - 3(2x + 9) = 10*x + 5*10 - 3 *2x + 9(-3) = 10x +50 -6x -27 = 4x + 23

exercise8.  -(12z + 1) + 2(7z - 5) = -12z-1+2*7z -5*2 = -12z -1 +14z -10 = 2z -11


Oct 9th, 2014

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