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Write in standard form (2b^2-b)+(b^2+4b-4)

PLEASE EXPLAIN ON HOW TO DO IT I WANT TO LEARN

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Since there is a plus sign between the two parentheses, add the like terms.

2b^2 + b^2 = 3b^2

-b + 4b = 3b

3b^2 + 3b - 4

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