0
Anonymous
-2x^2 = -50
x^2 = 25
x = 5, -5
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-7
x3 + 2x2 - 8x + 5 = 0 x(2x - 8) + 5 = 0
The discriminant is -199.
x2 + 7x = 2x2 + 6 x2 - 2x2 + 7x = 6 -x2 +7x - 6 = 0 or alternatively x2 - 7x + 6 = 0
22 = 4