Home › AP EAPCET (Engineering) › Mathematics › Complex Numbers and Quadratic Equations › The solutions of x^2 + 4 = 0 over the complex nu…
The solutions of x^2 + 4 = 0 over the complex numbers are
A±4i
B±i
C±2i
D±2
Answer & Solution
Correct answer: C. ±2i
x^2 = -4, so x = ±2i.
Related questions
Every real number a can be regarded as the complex numberThe real part of (2 + i)^2 isThe sum of z and its conjugate always equalsThe set of points with |z| = 1 in the complex plane formsIf |z| = 1, then the conjugate of z equalsWhich equation shows that the real number system needs extending?The modulus of a non-real cube root of unity isFor a cube root of unity ω, the value of ω^3 is