(Unip - SP) Se a = 3 + ³√2 e b = 3 - ³√2, então , o valor de (a - b) ³ será :
a)3√2
b)16
c)18√2
d)4√2
e)8√2
a = 3 + ³√2
b = 3 - ³√2
a - b = 3 + ³√2 - 3 + ³√2 = 2*³√2
(a - b)² = (2*³√2)³ = 2³*(³√2)³ = 8*2 = 16 (b)
.
(a - b) ³ = (3 + ³√2 - (3 - ³√2))³ = (3 + ³√2 - 3 + ³√2)³ = (³√2 + ³√2)³ = (2*³√2)³ = 8*2 = 16
( 3+ (raiz cúbica de 2) - ( 3 - (raiz cúbica de 2) ³
( 2 raiz cúbica de 2) ³
8 * 2 = 16
Letra B
(a-b)^3
( 3 + ³√2 - 3 + ³√2 )^3
( 2³√2 )³
8.2 = 16 --> letra (b)
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Verified answer
a = 3 + ³√2
b = 3 - ³√2
a - b = 3 + ³√2 - 3 + ³√2 = 2*³√2
(a - b)² = (2*³√2)³ = 2³*(³√2)³ = 8*2 = 16 (b)
.
a = 3 + ³√2
b = 3 - ³√2
(a - b) ³ = (3 + ³√2 - (3 - ³√2))³ = (3 + ³√2 - 3 + ³√2)³ = (³√2 + ³√2)³ = (2*³√2)³ = 8*2 = 16
( 3+ (raiz cúbica de 2) - ( 3 - (raiz cúbica de 2) ³
( 2 raiz cúbica de 2) ³
8 * 2 = 16
Letra B
(a-b)^3
( 3 + ³√2 - 3 + ³√2 )^3
( 2³√2 )³
8.2 = 16 --> letra (b)