Answer:
-5+12i
Step-by-step explanation:
(2+3i)^2
2^2+2×2×3i+(3i)^2
4+2×2×3i+(3i)^2
4+2×2×3i+3^2i^2
4+2×2×3i+9i^2
4+2×2×3i+9×-1
4+12i+9×-1
4+12i-9
(4-9)+12i
