Show me the steps to solve Given a flux function

$$B$($t$)=(5\mathrm{.}0$x$10^0)$t$2+(7\mathrm{.}000$x$10^0)$t $+(4\mathrm{.}000$x$10^0)$ Wb

Find the magnitude of the induced emf in volts at t $=(3\mathrm{.}000$x$10^0)$ seconds.