(a+b+c+d)^² Find it.
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4
Answer:
a^2 + b^2 + 2ab + c^2 + d^2 + 2cd + 2(a+b)(c+d).
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Answer:
(a+b+c+d)² = a² + b² + c² + d² + 2 (ab + ac + ad + bc + bd + cd).
Step-by-step explanation:
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