Factor the following:

16x2−81

Question 1 options:

(4x2−9)2

(4x−9)(4x+9)

(4x2−9)(4x2+9)

(4x−9)2

(4x2−9)(4x+9)

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?