Step 1 :\(a_2 = 3a_1 + 3 = 3 \times 7 + 3\)
Step 2 :\(a_3 = 3a_2 + 3\)
Step 3 :\(a_4 = 3a_3 + 3\)
Step 4 :\(a_5 = 3a_4 + 3\)