Question

(-9a+4b-c)-(-2b+4c-7d) subtract
I tried FOIL but I cant figure this out

Answer 1

remove the brackets
care with the 2nd set of brackets as its -1*-2b = 2b etc


-9a + 4b - c + 2b - 4c + 7d

collect the like terms (same letter)

-9a (4 +2)b +(-1-4)c + 7d

simplify for your answer

Answer 2

I got this far, but I am unsure because of all the letter (abcd) I am not sure how to incorparate that many in a simplified answer

Answer 3

The answer that campbell_st provided, short of combining the terms inside the brackets, is the simplified form.
-9a (4 +2)b +(-1-4)c + 7d

Answer 4

you can only add or subtract like terms.... they have the same letter(s) and powers... you cannot add -9a and 7d... different letters

Answer 5

-9a(6)b+(-5)c+7d ???

Answer 6

-9a + 6b-5c + 7d

Answer 7

ok just with out brackets

Answer 8

thats it