Question

Clara simplifies (8b-4r)-(2b-r) and says the result is 6b-5r. What error did Clara make?

HELP ASAP ONLY HAVE 15 MINS LEFT

Answer 1

Clara forgot to distribute the - sign to- (2b-r) through  all the terms  the answer would be 6b+3r

Answer 2

Clara makes error after opening the bracket she did not changes the sign of r .

Correct simplification of (8b-4r)-(2b-r) is 6b- 3r .

Explanation:

As given the expression in the question be

= (8b-4r)-(2b-r)

Open the bracket

= 8b - 4r - 2b + r

Solving the above

= 6b - 3r

Clara makes error after opening the bracket she did not changes the sign of r .

Therefore the correct simplification of (8b-4r)-(2b-r) is 6b- 3r .