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Like a parabola. Not "like": it would be.
ax2 + bx + c
quadratic formula
Look in an advanced maths book.Improved answer:-If the discriminant of the quadratic expression is less than zero then it's not possible to factor it.
Every quadratic equation has two solutions. If the quadratic expression that's equal to zero is a perfect square, then the two solutions are equal, and they look like one solution. Example: x2 - 6x + 9 = 0 (x - 3)(x - 3) = (x - 3)2 = 0 x = 3 and x = 3.