Question

PLEASE HELP ASAP I WILL GIVE BRAINLIEST!!!
Find the value of x.
Round to the nearest tenth.
х
3
120°
10
x = [?]
Law of Cosines: c2 = a2 + b2 - 2ab cos C
Enter

Answer 1

Answer:

x = 11.8

Step-by-step explanation:

x² = 3² + 10² - 2(3)(10) · cos120°

x² = 109 - (60 · cos120°)

x² = 109 - (-30)

x² = 139

x = $\sqrt{139}$ ≈ 11.8