27) C

To solve this, we need to use the equation:

(x – a) (x – b) = (x² – xb – xa + ab), where a and b are the solutions.

x² – xb – xa + ab = x² – x (b + a) + ab

We know that the sum of the roots of the quadratic equation is 7 and the product is 9.
i.e. (a + b) = 7 and (ab) = 9.

So, we need to substitute these values in. We get the equation:

x² – x (b + a) + ab = (x² – 7x + 9)

Hence the answer is C.