52-4*7*1 = -3
The discriminant is less than zero so the quadratic equation will have no solutions.
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There are none because the discriminant of the given quadratic expression is less than zero.
-7
The discriminant is 9.
-2.5 + 1.6583123951777i-2.5 - 1.6583123951777i
It is: (x+1)(x+4) none of which are prime numbers