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Expand the square of a binomial (r-q)^2​

User Anessa
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Answer:

Explanation:

Either memorize these two formulas, or derive them through multiplying r - q by r - q.

(r - q)^2 = r^2 - 2qr + q^2, and

(r + q)^2 = r^2 + 2qr + q^2 This is the square of the binomial (r + q).

User Alex Tonkonozhenko
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