2007-06-01 18:51:30 · 6 answers · asked by trina 1 in Science & Mathematics ➔ Mathematics
There are two distributive properties inside the brackets The first is 4(3x - 5y) = (12x - 20y). do not remove the parenthesis until the second distributive property has been performed. the second distributive property is (12x + 20y) - 9 = [ - 108x + 180y] Now the equations is - 2[-108x + 180y]
-2[4(3x - 5y) - 3²]
- 2 [ 4(3x - 5y) - 9]
- 2[ (12x - 20y) - 9]
- 2[- 108 + 180]
216x - 360y
- - - - - - - - - -s-
2007-06-02 02:43:12 · answer #1 · answered by SAMUEL D 7 · 1⤊ 0⤋
You mulitply out the inside bracket first by the 4:
-2 [ 4 ( 3x - 5y ) - 3^2
= -2 [ 12x - 20y - 9 ]
Then you mulitply the resulting bracket by the -2 giving you the answer:
-2 [ 12x - 20y - 9 ]
= -24x + 40y + 18
2007-06-02 06:55:11 · answer #2 · answered by Bright Spark 2 · 0⤊ 0⤋
-2[4(3x-5y)-3^2]
-2[4(3x-5y)-9] (Square the 3)
-2[12x-20y-9] (Distribute the 4 into the parentheses)
-24x+40y+18 (Distribute -2 into the brackets for the answer)
2007-06-02 02:02:08 · answer #3 · answered by mr. math 2 · 0⤊ 0⤋
first solve everythign from the inside
use the distributive property:
(12x-20y)-3^2
(12x-20y)-9
12x-20y-9 times this by -2
-24x+40y+18
your answer is -24x+40y+18
2007-06-02 01:58:34 · answer #4 · answered by Jeannie M 1 · 0⤊ 0⤋
--24x+40y+18
2007-06-02 03:29:57 · answer #5 · answered by whitey-chan 3 · 0⤊ 0⤋
-24x+40y-18
2007-06-02 01:57:36 · answer #6 · answered by tywan38 2 · 0⤊ 0⤋