1003067705 Level: AGiven complex numbers z1=−2+i, z2=1−4i and z3=−3i, find 2⋅z1+3⋅z2−4⋅z3.−1+2i7+2i11+26i−1+26i
1003067706 Level: AGiven complex numbers z1=−2+i, z2=1−4i and z3=−3i, find z1⋅z23⋅z3.−1+29i−1−29i1+29i1−29i
1003067707 Level: AFind the complex conjugate of the following complex number. 2−i2+i−2+i2−i85i−85i83i−83i
1003067708 Level: ALet z=1−i1+i+1+i1−i. If z is a complex number, find its absolute value.024Number z is not a complex number.
1103067709 Level: AChoose a diagram, which shows in red all the complex numbers whose absolute value is three.