English I don't understand french

Okay, I understand! My apologies for using French. I will switch to English for all explanations from now on. The 2(-1) comes from the formula used to find the x-coordinate of the turning point (vertex) of a quadratic function. For a quadratic function in the standard form f(x) = ax^2 + bx + c: The x-coordinate of the turning point is given by the formula: x = -(b)/(2a) In the previous question, the function was f(x) = -x^2 + 5x - 4. Let's identify the coefficients a, b, and c from this function: • a is the coefficient of x^2. Here, a = -1. • b is the coefficient of x. Here, b = 5. • c is the constant term. Here, c = -4. Now, when we substitute these values into the formula x = -(b)/(2a): • We replace b with 5. • We replace a with -1. So, the expression becomes: x = -(5)/(2(-1)) The 2 is part of the formula itself, and the (-1) is the value of a from the function f(x) = -x^2 + 5x - 4. What's next? 📸