[" EXAMPLE 20If "9^(x+1)+(a^(2)-4a-2)3^(...

[" EXAMPLE 20If "9^(x+1)+(a^(2)-4a-2)3^(x)+1>0" for all "x in R" ,"],[" then "],[[" (a) "a in R," (b) "a in R^(+)," (c) "a in1,oo)," (d) "a in R-12]]

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