Mathematics - Limits Question with Solution | TestHub

If the normal to the curve $\mathrm{y}=\mathrm{f}(\mathrm{x})$ at $\mathrm{x}=0$ be given by the equation $3\mathrm{x}-\mathrm{y}+1=0$ then the value of ${\lim }_{x\to 0}{x}^2{\left\{f\left(x^2\right)-5f\left(4x^2\right)+4f\left(7x^2\right)\right\}}^{-1}$ is