How do you evaluate #(b-4)^ -2# for b=1 ?

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Answer 1 · 2016-03-16T12:21:22

#1/9#

#color(blue)((b-4)^-2##,color(orange)(b=1#

Substitute the value of #b#

#rarr(1-4)^-2#

#rarr(-3)^-2#

Remember the law of exponents #color(brown)(x^-y=1/x^y#

#:.(-3)^-2=1/(-3)^2#

#rarr=1/((-3)(-3))#

#rArrcolor(green)(=1/9#