Question

$x ^{2} + 250x - 12500$
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Answer 1

X = -250 +- sqrt 250^2 -4*1*(-12500) / 2
X = -250 +- sqrt 62500 + 50000 / 2

Go ahead and use a calculator and do the rest .
If you have perfect square, then take the square root, factorise and solve .