The complex numberc + di is equal to (2 + i)^2. What is the value of c?
So we have
first, me must expand the quantity so let's do that
So, we have
In complex numbers the real part must equate with the real part and the imaginary part must equate with the imaginary part in a complex number so c must equal 3 since it is the only real part of 3+4i.