X^4+(2b^2-a^2)x^2+b^4

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

Which expression shows the sum of the polynomials with like terms grouped together