2006-10-03 05:14:28 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Distribute positive 7: 42x + 21
Distribute negative 3: -15x + 21
Combine like terms: 27x + 42
note the way I've set this up. By seperating what's happening, and looking at it verticaly, it's easier to see how the like terms can be combined.
NOTE: negative 3 times negative 7 results in a postive 21, NOT negative 21. 21's do not cancel.
.
2006-10-03 05:19:10 · answer #1 · answered by Manny 6 · 1⤊ 1⤋
First, take the integers 7 and 3 into the brackets.
that will become (42x+21) - (15x-21)
remove the brackets and it becomes 42x + 21 - 15x + 21
simplifying, you get 27x + 42.
If it is an equation, we can solve the value for x.
2006-10-03 12:54:28 · answer #2 · answered by cosmoboyin 2 · 1⤊ 0⤋
First, multiply the numbers on each side.
Step a:
7(6x+3)=
42x + 21
Step b:
-3(5x - 7)
-15x + 21
Now combine them all:
42x + 21 - 15x +21. Notice the negative signs cancel out.
27x + 42 is the answer.
2006-10-03 12:18:36 · answer #3 · answered by mysstere 5 · 0⤊ 2⤋
Using the distributive property, you get:
42x + 21 - 15x + 21
Simplify:
27x + 42
2006-10-03 12:23:20 · answer #4 · answered by Anonymous · 0⤊ 0⤋
7(6x+3) - 3(5x-7)
7*6x + 7*3 -3*5x -3*(-7)
42x + 21 -15x +21
27x + 42
2006-10-03 12:18:48 · answer #5 · answered by Amy Dee 2 · 2⤊ 1⤋
so you have got 7(6x+3)-3(5x-7)
step a: 42X +21 -15x-21
The answer is: 27x
Simple!!
2006-10-03 12:46:14 · answer #6 · answered by Anonymous · 0⤊ 1⤋
7(6x+3)-3(5x-7)=
[7(6x)+7(3)]-[3(5x)-3(7)]=
(42x+21)-(15x-21)=
42x+21-15x-(-21)=
42x+21-15x+21=
27x+42=
27x= - 42
x= - 42/27
x= -14/9
2006-10-03 12:26:51 · answer #7 · answered by Coco 5 · 0⤊ 2⤋
7(6x+3)-3(5x-7)
=7*6x+7*3-3*5x+7*3
=42x+21-15x+21
=42x-15x+21+21
=x(42-15)+42
=x*27+42
=27x+42
=3(9x+14)
2006-10-03 12:30:03 · answer #8 · answered by Anonymous · 1⤊ 0⤋
remove parentheses-
42x+21 - 15x +21
42x - 15x
27x
2006-10-03 12:31:44 · answer #9 · answered by rwbblb46 4 · 0⤊ 1⤋