0
x2 + 5x - 25 is a polynomial that can't be factored. If however it has a definite value, then the value of x can be calculated.
x2 + 5x - 25 = c
x2 + 5x + 25 = c - 50
(x + 5)2 = c - 50
x + 5 = ±(c - 50)1/2
x = ±(c - 50)1/2 - 5
So if c = 0, x would be equal to both 5i√2 - 5 and -(5i√2 + 5)
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