In problems 1–4, perform the indicated operations. write each answer as a complex number a+
1. let z1 = −2 + i, z2 = 3 − 2i, and = z1 + z2. find and graph z1, z2, and in the complex plane.
2. let z1 = −1 − i, z2 = 2 + 2i, and = z1 − z2. find and graph z1, z2, and in the complex plane.
3. let z = −2 + i and = −2z. find and graph z and in the complex plane.
4. let z1 = 1 + 2i, z2 = 2 − i, and = z1 ⋅ z2. find and graph z1, z2, and in the complex plane