Ao wants to check that the expression 3(4x – 6) simplifies to 12x – 18. what is the value when 2 is substituted for x into both expressions?

First, let's substitute 2 for x in the expression, 3(4x-6)

3(4(2)-6) = 3(8-6) = 3(2) = 6

The operations within the parenthesis should be done first.Multiplication is next. 4*2 = 8Then subtraction. 8-6 = 2Finally, multiply once again. 3*2 =6

Next, let's substitute 2 for x in the expression, 12x-18

12(2)-18 = 24-18 = 6

Multiplication comes first in the order of operations. 12*2 = 24Then, subtraction. 24-18 = 6

The value of both expressions when substituting x for 2 is 6.

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm