Having problems understanding exponet

Algebra
Tutor: None Selected Time limit: 1 Day

10 − (70 − 42)−2
Nov 3rd, 2014

see, 1^0=1

7^0=1 4^2=16

then we have

1- (1-16)^-2=1-(1/1-16^2)

= (1-16^2-1)/1-16^2=16^2/1-16^2=1/1-256=1/1-255

the answer is 1/1-255

 choose  me as the best

Nov 3rd, 2014

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