Let $x_1$ and $x_2$ be the roots of the equation $ax^2 + bx + c = 0$ ($ac \neq 0$). Find the value of $\frac{1}{x_1} + \frac{1}{x_2}$.
Choose the most appropriate options. The degree of the differential equation \[ x = 1 + \frac{dy}{dx} + \frac{1}{2!} \left( \frac{d^2y}{dx^2} \right) + \frac{1}{3!} \left( \frac{d^3y}{dx^3} \right) + ... \]
Choose the most appropriate options.If \( A(2,3) \) and \( B(-2,1) \) are two vertices of a triangle and the third vertex moves on the line \( 2x + 3y = 9 \), then the locus of the centroid of the new set of observations will be the triangle is
The inverse of matrix \[ \begin{pmatrix} 0 & 1 & -1 \\ 4 & -3 & 4 \\3 & -3 & 4 \end{pmatrix} \] is
Choose the most appropriate option. If \( A \) is a square matrix such that \( A^2 = A \) and \( B = I \), then \( AB + BA + I - (I - A)^2 \) is equal to:
Choose the most appropriate options. If \( f(x) = [x \sin n\pi x] \), then which of the following is incorrect?