# GATE Papers >> ECE >> 2015 >> Question No 155

Question No. 155

Let $x(t)=\alpha\;s(t)+s(-t)$ with $s(t)=\beta e^{4t}u(t)$ , where $u(t)$ is unit step function . If the bilateral Laplace transform of $x(t)$ is

Then the value of $\beta$ is______.