OCR C2 — Question 2

Exam BoardOCR
ModuleC2 (Core Mathematics 2)
TopicSine and Cosine Rules
2. The diagram shows triangle \(P Q R\) in which \(P Q = x , P R = 7 - x , Q R = x + 1\) and \(\angle P Q R = 60 ^ { \circ }\). Using the cosine rule, find the value of \(x\).
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