0
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x times x
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-1
y = -9
y2-x2 = (y+x)(y-x)
(x + 4)(x + 1)
so x squared + 12 = 0 so xsquared = -12 which lands you in the realm of imaginary numbers. The square root of -12 is 2i root 3 where i is the imaginary sqrt of -1.