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3^{x²+4} >3^{4x}
x²+4>4x
x²-4x+4>0
(x-2)²>0
x∈R \{2}
f)
1/8≤2^{x²-10}
3^{-2}≤2^{x²-10}
x²-10≥-2
x²-8≥0
(x+2√2)(x-2√2)≥0
x∈(-∞,-2√2> u <2√2,+∞)