Evaluate the following :2x3 + 2x2 – 7x + 72, when

Given:⇒ ⇒ 2x3+2x2-7x+72⇒ ⇒ We know that i2=-1⇒ ⇒ ⇒ ⇒ ⇒ ⇒ -68+72⇒ 4∴ 2x3+2x2-7x+72=4

Q16 of 153 Page 13

Evaluate the following :
2x³ + 2x² – 7x + 72, when

Given:

⇒

⇒ 2x³+2x²-7x+72

⇒

We know that i²=-1

⇒

⇒ -68+72

⇒ 4

∴ 2x³+2x²-7x+72=4

If find (a, b).

If a = cos θ + i sin θ, find the value of

Evaluate the following :

x⁴ – 4x³ + 4x² + 8x + 44, when x = 3 + 2i

Evaluate the following :

x⁴ + 4x³ + 6x² + 4x + 9, when x = - 1 + i√2