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what does (9x^2+6x+1) - (9x^2-6x+1) equal

 
 please solve this problem

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Philip P. | Effective and Affordable Math TutorEffective and Affordable Math Tutor
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(9x2+6x+1) - (9x2-6x+1)
 
Distribute the - across the terms in parentheses
 
= 9x2 + 6x + 1 - 9x2 + 6x - 1
 
Combine like terms to simplify