9а^2 - 4b^2- За - 26
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Step-by-step explanation:
9а^2 - 4b^2- За - 2b=(3a)^2-(2b)^2-(3a+2b)
=(3a-2b)(3a+2b) - (3a+2b)
=(3a+2b)(3a-2b-1)
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