I just encountered this question in the exam and I don't know what method to use here..

If the roots of the equation 2x^2+4x+7=0 are p and q , then the value of 1/p+1/q is :

The choices are:

A. -2

B. 7/2

C-4/7

D.7/4

E. none of the above.

Can somebody show me the step by step procedure how to solve this type of problem:

Any help would be appreciated..