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Finding the Difference (9b25b4)(3b25b7)(9b^2 - 5b - 4) - (3b^2 - 5b - 7)

Find the difference of the polynomials:

(9b25b4)(3b25b7)(9b^2 - 5b - 4) - (3b^2 - 5b - 7)

First, distribute the subtraction by changing the sign of every term in the second polynomial:

9b25b43b2+5b+79b^2 - 5b - 4 - 3b^2 + 5b + 7

Next, rearrange the terms to group the like terms together:

9b23b25b+5b4+79b^2 - 3b^2 - 5b + 5b - 4 + 7

Finally, combine the like terms. Notice that 5b+5b=0-5b + 5b = 0, so the bb-term is eliminated:

6b2+36b^2 + 3

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Updated 2026-04-29

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Ch.5 Polynomials and Polynomial Functions - Intermediate Algebra @ OpenStax

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