I got you Gilbert.
The sum of the zeroes of a quadratic equation in the form of ax^2 + bx + c is given by -b/a. In this case, the sum of the zeroes of the polynomial 5x^2 - px + 7 is 9. Therefore, we can write the equation as:
-b/a = 9
where b = -p and a = 5. Substituting these values, we get:
-(-p)/5 = 9
Simplifying this equation, we get:
p/5 = 9
Multiplying both sides by 5, we get:
p = 45
Therefore, the value of 'p' is 45.