Si a-b= 5 y ab=3. Halla:a³-b³
alternativas:
a)160 b)140 c)170 d)180 e)190
alternativas:
a)160 b)140 c)170 d)180 e)190
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Respuesta:
c)170
Explicación paso a paso:
(a - b)³ = 5³
a³ - b³ - 3(ab)(a - b) = 125
a³ - b³ = 125 + 45
a³ - b³ = 170