Answer:
<em>The coefficient of the squared expression in the parabolas equation will be 5.</em>
Step-by-step explanation:
<u>The vertex form of parabola</u> is:
, where
is the vertex point and
is the coefficient of
term.
The vertex is given as
. That means,
and 
So, the vertex form will be: 
Given that, when the x-value is 4, the y-value is 3. So, plugging these values into the above equation, we will get.....

Thus, the coefficient of the squared expression in the parabolas equation will be 5.