Expand and simplify:
6(m - 6) - 8(m-4)^2 + 4(m + 4)^2
I spent 5 HOURS today trying to get my answer to match the one in the book. The book says the answer to this is 2m^2 + 24m + 152.
I get the answer down to is: 6m -36 + 4m^2 + 32m + 64 -8m^2 + 64m - 128. When i substitute "m" for the number 5 in the original expression, and substitute "m" for the number 5 in my more simplified expression (6m -36 + 4m^2 + 32m + 64 -8m^2 + 64m - 128) the answers are the same. Which means i'm right doesnt it? But if i simplify my answer more by adding and subtracting the like terms it doesn't work anymore and it also doesn't match the answer in the book.
What the heck am i doing wrong?
BTW: ^2 means squared.
6(m - 6) - 8(m-4)^2 + 4(m + 4)^2
I spent 5 HOURS today trying to get my answer to match the one in the book. The book says the answer to this is 2m^2 + 24m + 152.
I get the answer down to is: 6m -36 + 4m^2 + 32m + 64 -8m^2 + 64m - 128. When i substitute "m" for the number 5 in the original expression, and substitute "m" for the number 5 in my more simplified expression (6m -36 + 4m^2 + 32m + 64 -8m^2 + 64m - 128) the answers are the same. Which means i'm right doesnt it? But if i simplify my answer more by adding and subtracting the like terms it doesn't work anymore and it also doesn't match the answer in the book.
What the heck am i doing wrong?
BTW: ^2 means squared.