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## Homework Statement

Determine the range of values of the constant a so that the solution of ax^2+2ax+3>=0 (when a >0) is all real numbers

## Homework Equations

D = b^2-4ac

## The Attempt at a Solution

The discriminant is 0, 3. I need to know how to arrange them to get the range. The range is 0<a<=3 in the answers. How do I get it?