Complex numbers as ordered pairs; representation in argand plane; algebra of complex numbers; modulus and argument; triangle inequality; quadratic equations in real and complex number system; relations between roots and coefficients; nature of roots; formation of quadratic equations with given roots.
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Q1 · Complex Numbers and Quadratic Equations · EASY
If z = 3 + 4i, then the value of |z|² is:
Q2 · Complex Numbers and Quadratic Equations · EASY
If one root of the equation x² - 6x + k = 0 is twice the other root, then the value of k is:
Q3 · Complex Numbers and Quadratic Equations · MEDIUM
The argument of the complex number (1 + i)/(1 - i) is:
Q4 · Complex Numbers and Quadratic Equations · MEDIUM
If α and β are the roots of x² + px + q = 0, then the equation whose roots are α² and β² is:
Q5 · Complex Numbers and Quadratic Equations · HARD
If z₁ and z₂ are two complex numbers such that |z₁| = |z₂| and arg(z₁) + arg(z₂) = π, then z₁ + z₂ equals: