Question

(9+r)^2 = (18-r)^2 + 9^2
Find r

Answer 1

( 9 + r) ^2 = ( 18 - r ) ^2 + 9^2

81 + r^2 + 18r = 324 + r^2 - 36r + 81

18r + 36 r = 288

54r = 288

r = 288 /54 = 6

r = 6.

Answer 2

Answer:

6

Step-by-step explanation:

expanding both sides give

81 + r^2 +18r =324 +r^2 - 36r +81

54r=324

r=6