Given:3x2 + 7ix + 6 = 0⇒3x2 + 9ix-2ix + 6 = 0⇒⇒ …(i2 = -1)⇒ = 0⇒⇒⇒x + 3i = 0 & 3x-2i = 0⇒ x = 3i & Ans: x = 3i and

Q17 of 202 Page 206

3x² + 7ix + 6 = 0

Given:

3x² + 7ix + 6 = 0

⇒3x² + 9ix-2ix + 6 = 0

⇒

⇒ …(i² = -1)

⇒ = 0

⇒

⇒x + 3i = 0 & 3x-2i = 0

⇒ x = 3i &

Ans: x = 3i and

3x² + 5 = 7x

21x² – 28x + 10 = 0

x² + 13 = 4x