Question

prove that (z1 +z2)² = z²1 + z²2 + 2z1z2

Answer 1

hi friend ✋

to prove: (z1+z2)²=z1¹+z2²+2(z1)(z2)

we know that (z1+z2)²= (z1+z2)(z1+z2) ...........(1)

now expand (1)

(z1+z2)²= z1²+z2²+z1 z2+z2 z1 =z1²+z2²+2(z1)(z2)

hope it helps

Answer 2

I hope help this attachments