Question: how to solve quadratic equation without calculator?
Answer: x2 + 5x + 6 = 0 To solve this equation, you'll need to think of two numbers that add up to five and multiply to make six. You can add two and three to make five, or multiply two times three to get six, so these are your factors for this example. You'll want to write your answer like this: x2 + 5x + 6 = (x + 3)(x + 2).