If (m-n)²=64 and mn=180, then (m+n)² is

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If (m-n)²=64 and mn=180, then (m+n)² is

A784

B626

C729

D676

Answer:

A. 784

Read Explanation:

(m-n)²= m²-2mn+n² 64=m²+n²-2x180 m²+n²=64+360=424 (m+n)²=m²+2mn+n² = 424 +360=784

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