U^2- 12u+ make it a perfect square

If sin θ=24/25 and 0 less than or equal to θ less than or equal to π/2, find the exact value of tan 2θ. answers; a) -527/336 b) -336/527 c)7/24 d) 24/7

What is the equation of the graph below? y=sec(x)-4

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us