well first he should have multiplied 1 and 3 then 3 and 3 then added them up and multiplied the 5 by 5 and made it into this 2(3+9) -25 this would have became 2(12) -25 witch the would be 24-25 and then became -1
One error is in step one you would do 4 to the 3rd power then 5 squared then you can multiply the product of 4 to the 3rd powerby 2 then subtracted the product of 5 squared.
