4x^2-x-3=0 solve by completing the square x= ? ?

Find the length of the following tangent segments to the circles centered at o and o' whose radii are 5 and 3 respectively and the distance between o and o' is 12. what is the tangent segment of cd?

Answer this question! 30 points and brainliest! only if you know the answer.

Write a fraction less than 1, which has a denominator of 6 and is greater than 3/4 plz answer !