Question 1 of 10 Use the grouping method to factor the polynomial below completely. x3 + 2x2 + 4x+8

A. (x2 + 4)(x+4)

B. (x2 + 2)(x+2)

C. (x2 + 4)(x + 2)

D. (x2+2)(x+4)​

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)