The value of x2+5x+6 at x=2?

The value x² + 5x + 6 at x=2?

(A) 2
(B) 10
(C) 15
(D) 20

Answer: (D) 20

Solution:
By putting the of x = 2 in the equation
we have, 2² + 5×2 + 6
4 + 10 + 6 = 20

so the right answer is 20.