Before learning anything in math, there's one question we should always ask: Why learn this? Why do we even need factoring? If we don’t know the answer, two things happen: First, we lose interest. We just hear the teacher talk and nod along — but we don’t *feel* anything. No curiosity. No purpose. Just passive learning. Second, during exams, we won’t know *when* to use it. If we don’t know what it’s for, we’ll never recognize the moment it’s needed. So — what is factoring *for*? Let’s look at an example. Suppose you’re asked to solve: f(x) = x³ – 36x When does f(x) = 0? You could plug in values one by one: x = 1? Nope. x = 2? Nope. x = 3? Still no... But that’s not how mathematicians think. We factor. Step 1: There’s a common factor — x. So we pull it out: f(x) = x(x² – 36) Step 2: Spot the difference of squares. x² – 36 = (x + 6)(x – 6) So now: f(x) = x(x + 6)(x – 6) Now it’s easy to solve. We just ask: When is this product zero? Answer: x = 0, x = –6, or x = 6. Done. See what just happened? Factoring turned a 3rd-degree equation into a 2nd-degree expression, then into three simple 1st-degree factors. Factoring *reduces the degree*. That’s the real use. That’s the power. Once the degree is lower, we can use basic logic or substitution to solve it. So now, when you see a high-degree expression — x³, x⁴, x⁵… Don’t panic. Just ask: “Can I factor this down?” Because factoring isn’t just a skill. It’s a shortcut to simpler problems.

视频信息