Which expression is equal to (f · g)(x)?

A

Step-by-step explanation:

Note that

x² + 12x + 36 is a perfect square → (x + 6)², hence

= = (x + 6)

Hence

f(x) × g(x)

= (x + 6)(x³ - 11)

= - 11x + 6x³ - 66

= + 6x³ - 11x - 66 → A

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)