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[tex] 2^{2x-1} + 2^{2x-2}+2^{2x-3} \geq 448[/tex]
[tex] 2^{2x-1} + 2^{2x-2}+2^{2x-3} \geq 448[/tex]
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2^(2x-1) + 2^(2x-2) + 2^(2x-3) >= 4482^(2x-3)*(2^2 + 2^1 + 2^0) >=448
2^(2x-3) * 7 >= 448
2^(2x-3) >= 64
2^(2x-3) >= 2^6
2x-3 >= 6
2x>=9
x>=9/2
x>=4.5