exam Maths Puzzle Numerical Ability

5a^2 X 4ab^5

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Then angle x satisfies the equation 2tan^2x-5secx-10=0, where x is in the second quadrant. Find the exact value of sec x.

I know that the identity of 1+tan^2x=sec^2x may help me in this problem, but I am not sure what to do next. Thanks a lot!. four times the sum of r and s, increased by twice the difference of r and s