5×3^x-4×3^x-1⩾99
5*3*3^(x-1) - 4*3^(x-1) ≥ 99
11*3^(x - 1) ≥ 99
3^(x - 1) ≥ 9
3^(x - 1) ≥ 3^2
x - 1 ≥ 2
x ≥ 3
x ∈ [3, +∞)
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5×3^x-4×3^x-1⩾99
5*3*3^(x-1) - 4*3^(x-1) ≥ 99
11*3^(x - 1) ≥ 99
3^(x - 1) ≥ 9
3^(x - 1) ≥ 3^2
x - 1 ≥ 2
x ≥ 3
x ∈ [3, +∞)