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Musya8 [376]
3 years ago
6

Use cosine law to find the value of x. Show working. use ^ for power and sqrt for square root

Mathematics
2 answers:
AlexFokin [52]3 years ago
8 0
See the picture below
melamori03 [73]3 years ago
8 0

Answer:

x ≈ 11.89

Step-by-step explanation:

Using the cosine rule

x² = 4² + 9² - ( 2 × 4 × 9 × cos128° )

    = 16 + 81 - 72cos128°

     = 97 - (- 44.33 )

      = 141.33 ( take the square root of both sides )

x = \sqrt{141.33} ≈ 11.89 ( to 2 dec. places )

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