It could be that 144 is a square number because 12*12 = 144
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a=12
Set it up like this:144=.6x (144 equals .6 times what number?)144/.6=x240=x
Yes, empty set means null which is no solution.
(x^2) + 24x + 144 = -9 x = -12
An empty set is a set with no elements. It can be symbolized by {} or ø. The solution set for an equation that has no solution is also called an empty set.