2. Simplify (4m + 5)² + (5m + 4n)²
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Answer:
(4m + 5n)² +(5m+4n)²
[(4m)²-2(4m)(5n) +(5n)²]+[(5m)²+2 (5m) (4n)+(4n)²]
=16m²+20mn +25n²+25m²+40mn+16n²
=(16+25)m²+(40+40)mn+(25+16)n²
=41m²+80mn+41n²
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