Answer:
Step-by-step explanation:
To find out vertex apply the formula x=-b/2a
The value of a=2 and b=28
Now plug in x=-7 in f(x) equation and find out f(-7)
Vertex is (-7,-103)
Now use vertex formula
a=2, h=-7, k=-103
Plug in all the values in the vertex form equation
Answer is 8
Work Shown:
f(x) = sqrt(5*x + 4)
f(12) = sqrt(5*12 + 4) ... replace every x with 12
f(12) = sqrt(60 + 4)
f(12) = sqrt( 64 )
f(12) = 8