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Finding the Difference (9b2−5b−4)−(3b2−5b−7)(9b^2 - 5b - 4) - (3b^2 - 5b - 7)

Find the difference of the polynomials:

(9b2−5b−4)−(3b2−5b−7)(9b^2 - 5b - 4) - (3b^2 - 5b - 7)

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

9b2−5b−4−3b2+5b+79b^2 - 5b - 4 - 3b^2 + 5b + 7

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

9b2−3b2−5b+5b−4+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 2026-06-03

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