Answers

  • Brainly User
2016-03-21T00:21:31+05:30
In right triangle PQR, by Pythagoras theorem PQ2 = PR2 +PQ2 

⇒ 17²= (x+9)² + (x+2)² 

⇒ x² + 11x – 102 = 0

⇒ x² + 17x – 6x – 102 = 0

⇒ x(x+17) – 6(x+17) = 0 

⇒ (x-6)(x+17) = 0

⇒ x = 6 or x = -17  

⇒ x = 6 cm (x can’t be negative)
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