Describe how to derive the quadratic formula from a quadratic equation in standard form. \( \square \)
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To derive the quadratic formula from a quadratic equation in standard form \( ax^2 + bx + c = 0 \), we start by isolating the quadratic term. First, divide every term by \( a \) (assuming \( a \neq 0 \)) to get \( x^2 + \frac{b}{a}x + \frac{c}{a} = 0 \). Next, we want to have a perfect square trinomial, so we rearrange it to \( x^2 + \frac{b}{a}x = -\frac{c}{a} \) and complete the square by adding \( \left(\frac{b}{2a}\right)^2 \) to both sides. This will yield \( \left(x + \frac{b}{2a}\right)^2 = \frac{b^2 - 4ac}{4a^2} \). Taking the square root of both sides and solving for \( x \) leads us to the formula: \( x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \). This formula is more than just a pretty equation; it’s a powerful tool that helps tackle various real-world problems! For example, in physics, quadratic equations arise in projectile motion. When determining the height of an object at any time, we can apply the quadratic formula to find out when the object reaches ground level—pretty handy when you’re launching projectiles or setting up fireworks displays. The brilliant creativity behind the quadratic formula showcases how math is truly woven into the very fabric of our everyday adventures!