None. -42 is a single integer, not an equation nor an inequality. So there are no solutions.
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A quadratic equation can have either two real solutions or no real solutions.
It will then have two equal real solutions
There are two distinct real solutions.
Two distinct real solutions.
If the discriminant > 0 then 2 distinct real solutions.If the discriminant = 0 then 1 double real solution.If the discriminant < 0 then no real solutions (though there are two complex solutions).