Question

Question 1 Express the given complex number in the form a + ib: (5i) (-3i/5)

Class X1 - Maths -Complex Numbers and Quadratic Equations Page 103

Answer 1

(5i)(-3/5i)
We know,
(ai)(bi) = (ab)i² = -(ab)

= (5i)(-3/5i)
= (5× -3/5)i²
= (-3)i²
= (-3)(-1)
= 3 or 3 + 0i

Hence, 3 + 0i is the answer.