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cara 1
(5a+4b)² = (5a+4b)(5a+4b)
= 5a(5a+4b) + 4b(5a+4b)
= 25 a² + 20 ab + 20 ab + 16b²
= 25 a² + 40 ab + 16 b²
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cara II
(5a+4b)² = (5a)² + 2 (5a)(4b) +(4b)²
= 25 a² + 40 ab + 16 b²