[tex](a - b) ^{2} = {a}^{2} - 2ab + {b}^{2} \\ = {a }^{2} + 2ab + {b}^{2} - 4ab \\ = (a + b) ^{2} - 4ab \\ = 5 ^{2} - 4(3) \\ = 25 - 12 = 13 [/tex]
luego,
[tex](a - b) ^{2} =13[/tex]
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[tex](a - b) ^{2} = {a}^{2} - 2ab + {b}^{2} \\ = {a }^{2} + 2ab + {b}^{2} - 4ab \\ = (a + b) ^{2} - 4ab \\ = 5 ^{2} - 4(3) \\ = 25 - 12 = 13 [/tex]
luego,
[tex](a - b) ^{2} =13[/tex]