Question

$(2 m- 8n)2 + (2m + 8n)2$
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Answer 1

(2m-8n)²+(2m+8n)²

(2m)²+(8n)²-2×2m×8n+(2m)²+(8n)²+2×2m×8n

4m²+64n²-32mn+4m²+64n²+32mn

8m²+128n²

8(m²+16n²)