Question

Simplify: (a - b)(c - d) + (a - b)(c + d) + 2(ac + bd)​

Answer 1

Answer:

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Answer 2

Answer:

(a+b)(c−d)+(a−b)(c+d)+2(ac+bd)

=(ac+bc−ad−bd)+(ac+ad−bc−bd)+2(ac+bd)

=4ac.