Y= 40 x is the answer, hope this helped.
<em>The value of b is 14 and the value of c is 65</em>
<h2>
Explanation:</h2>
The quadratic function is a function of the form:

Here we know that the leading coefficient
so we reduce our equation to:

The roots are those values at which 
So:


So we have:

Finding c from (1):

<h2>Learn more:</h2>
Complex conjugate: brainly.com/question/2137496
#LearnWithBrainly
Answer:
26 year old
Step by step explanation:
Five years ago, John's age was half of the age he will be in 8 years.
this means that (x-5) = (x+8)/2
-----
solving for x, we get:
2 * (x-5) = x + 8
which becomes:
2x - 10 = x + 8
which becomes:
x = 18
-----
john is 18 years old now.
5 years ago john was 13
8 years from now john will be 26
13 = 1/2 * 26