The average of the polynomials, 2x2 + 5x -6, 5x2 – 5x – 6 and 30 – 7x2 is:
(A) 14
(B) 6
(C) 18
(D) 5x
Answer: (B) 6
Solution:
First, we find the sum of the three polynomials, than divide the answer by 3.
Sum of the three polynomials
2x2 + 5x – 6
5x2 – 5x – 6
-7x2 + 30 / 18
Now, Average = Sum of the three polynomials / 3
= 18 / 3 = 6
so. the answer is 6.