How do you evaluate (-128) ^(6/7)?

Answer 1

(-168)^(6/7)

[(-168)^6]^(1/7)

[(168)^6]^(1/7) Ignore the negative sign with an even exponent

[168]^(6/7)

[8*16]^(6/7)

[2^3 * 2^4]^(6/7)

[2^7]^(6/7)

[(2^7)^(1/7)]^6

[2]^6

2^3 * 2^3

8 * 8

64