What is the average (arithmetic mean) of x2 - 2x - 3 , 3x2 - 2x - 3 and 30

What is the average (arithmetic mean) of x² - 2x - 3 , 3x² - 2x - 3 and 30 - 4x² ?

A (8x² + 4x + 24) / 3

B (8x² + 24)

C (24 - 4x) / 3

D -12

Correct Answer: Option C

(x² - 2x - 3) + (3x² - 2x - 3) + (30 - 4x²)
= x² - 2x - 3 + 3x² - 2x - 3 + 30 - 4x²
= 24 - 4x

গড় = (24 - 4x)/3