3{[3(x-5)15]-[3(4x-3) +3]}
I need help to simply this. I have been working on this for 2 hours and still don’t get it, can anyone help?
Is there a plus or minus sign missing in this problem? Specifically after the (x-5) and before the 15?
3{[3(x-5) ? 15]-[3(4x-3) +3]}
Assuming there is +/- sign missing, here's what I would do:
(1) Look at the expression inside the first set of brackets []. Distribute the 3 to the x and the -5. Then combine like-terms within those brackets.
(2) Look at the expression inside the second set of brackets []. Distribute the 3 to the 4x and the -3. Then combine like-terms within those brackets.
(3) Subtract those two expressions from each other paying close attention that the negative sign gets distributed to the entire 2nd expression. Combine like terms.
(4) Distribute the 3 outside the {expression} to get your final answer.
If there was a "+" sign:
3{[3x-5)+15]-[3(4x-3)+3]}
3{[3x-15+15]-[12x-9+3]}
3{[3x]-[12x-6]]
3{3x-12x+6}
3{-9x+6}
-27x+18
If there was a "-" sign:
3{[3(x-5)-15]-[3(4x-3)+3]}
3{[3x-15-15]-[12x-9+3]}
3{[3x-30]-[12x-6]]
3{3x-30-12x+6}
3{-9x-24}
-27x-72