SOLUTION: 6z^2 + 15z - 8 ≤ 0

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Question 1111919: 6z^2 + 15z - 8 ≤ 0
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
Quadratic inequality, using discriminant cross%2833%29=15%5E2-4%2A6%2A%28-8%29=417
Roots %28-15%2B-+sqrt%28417%29%29%2F12 .


%28-15-sqrt%28417%29%29%2F12%3C=z%3C=%28-15%2Bsqrt%28417%29%29%2F12

Answer by ikleyn(52776) About Me  (Show Source):
You can put this solution on YOUR website!
. 
Discriminant =  15%5E2-4%2A6%2A%28-8%29 = 417.


Roots   z%5B1%2C2%5D = %28-15%2B-+sqrt%28417%29%29%2F12 .



%28-15-sqrt%28417%29%29%2F12 < = z <= %28-15%2Bsqrt%28417%29%29%2F12.

Be aware :   The answer by  @josgarithmetic is   W R O N G.