Your answer would be 9^13
Clara forgot to distribute the - sign to- (2b-r) through all the terms the answer would be 6b+3r
Vas happening?
You break it down
3 ^5 is 3 x 3 x 3 x 3 x 3 = 729
4 ^ 5 is 4 x 4 x 4 x 4 x 4 = 1024
729 times 1024 = 746,496
12 ^ 10 is 12 x 12 x 12 x 12 x 12 x 12 x 12 x 12 x 12 x 12 = 6.19174e10
So the answer is incorrect
the answer would be 
because you would need to find the LCD, which in this case would be 56 and you solve from there.
