Answer:
D
Step-by-step explanation:
25 and 6
Coefficient is the number in front of the unknown variable
ANSWER

EXPLANATION
The given function is:

Factor -3 for the first 2 terms.

We add and subtract the square of the coefficient of x.

Factor the perfect square trinomial.

The vertex form is:

Do you mean 6 to the 5th power. or is there another 6, if so then it would be 6 to the 6th power.