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Answer 1 · 2017-11-19T15:01:40

#1/49#

From the Laws of Indices, #a^-m=1/a^m#

So #(-7)^-2=1/(-7)^2#
#=1/49#

Answer 2 · 2017-11-19T15:02:50

1/49

#(-7)^-2=1/(-7)^2=1/((-1)^2*7^2)=1/49#