Find two integers whose sum is -3 and product is -18

Given right triangle xyz, which correctly describes the locations of the sides in relation to

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

Evaluate cos2θ for cosθ = square root of 3/2