When do I use x = [−b ± √(b²−4ac)] / 2a in Quadratic Equations, and what does it mean?
the quadratic formula for the roots.
x = [−b ± √(b²−4ac)] / 2a — the quadratic formula for the roots. Use it when: any quadratic ax²+bx+c=0. Always check the condition holds before plugging in numbers.
Key point
x = [−b ± √(b²−4ac)] / 2a
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