vertex form is 
comlpete the square

group x terms

factor quadratic coefient

take 1/2 of linear coefient and square it
4/2=2, 2^2=4
add positive and negative of it inside the parentheasees

factor perfect squarer trinomial

expand

is vertex form
Answer:
f(3) = -11
Step-by-step explanation:
f(x) = -3x - 2
f(3) = -3(3) - 2 = -9 - 2 = -11
Answer:

Step-by-step explanation:
Given



Required
Determine the length of the base
The perimeter of an isosceles triangle is:



Collect Like Terms


Divide both sides by 7

To get the base, we substitute 19 for x in 


Ln 26 = 3.2581 to the nearest ten thousandth
I think 3.323 units would be the correct answer. Are you asking what the length of a single side is?