x2 + 49
= x2 - (-49)
= x2 - (-1)(49)
= x2 - (i2)(72)
= x2 - (7i)2
= (x - 7i)(x + 7i)
where i is the imaginary square root of -1.
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x2 + 49 = 0 ∴ x2 = -49 ∴ x = 7i
x2+14x+49 = (x+7)(x+7) when factored
51.07142857142857
7
Yes