MCQ Subject: Algebra

A quadratic equation ax² + bx + c = 0 has real roots if which of the following conditions is met?

For a quadratic equation ax² + bx + c = 0, where a, b, and c are real numbers and a ≠ 0, which condition guarantees that the equation has two distinct real roots?

In an arithmetic progression, the sum of the first n terms can be calculated using which formula?