1) distribute the factors into parentheses
2(12b)≥8b4(23b) ⇔1+4b≥8b+8+12b ⇔ 4b1≥20b+8
Now collect factors with b in one side, numbers in another.
4b20b≥8+1
16b≥9
b≤9/16 (Remember: inequality changes sign from > to < when multiplied or divided by a negative number!)
Answer: b≤9/16 or b≤0.5625
9/26/2013

Kirill Z.
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