Factor the polynomial 3x4 - 2x2 + 15x2 – 10 by grouping.
Which product is the factored form of the polynomial?
o (=x2 - 5)(3x2 + 2)
O (22 – 2)(3x2 + 5)
O (22 + 5)(3x2 – 2)
(3x2 - 5)(22 + 2)

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?