Full equation is (-b +/- sqrt(b2 - 4ac))/2a.
Try it with x2 - 2x - 3, where a = 1, b = -2 and c = -3...
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The quadratic equation in standard form is: ax2 + bx + c = 0. The solution is x = [-b ± √b2- 4ac)] ÷ 2a You can use either plus or minus - a quadratic equation may have two solutions.
y = ax^(2) + bx + c Solution is the Quadratic Eq'n. x = {-b +/-sqrt[b^(2) - 4ac]} / 2a
In the quadratic equation, b^2 - 4ac < 0.
Write the quadratic equation in the form ax2 + bx + c = 0 The roots are equal if and only if b2 - 4ac = 0. The expression, b2-4ac is called the [quadratic] discriminant.
It is the value of the discriminant of a quadratic equation.