Verify That $a _ { n } = 7 \cdot 3 ^ { n } - \pi$

Short Answer

Verify that $a _ { n } = 7 \cdot 3 ^ { n } - \pi$ is a solution to the recurrence relation $a _ { n } = 4 a _ { n - 1 } - 3 a _ { n - 2 }$