CD = √(BC²-BD²) = √(20²-16²) = √(400-256) = √144 = 12cm.
AC = √(AD²+CD²) = √(9²+12²) = √(81+144) = √225 = 15.
4x - 1 = 15 <=> 4x = 15 + 1 = 16 <=> x = 16 ÷ 4 = 4.
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CD = √(BC²-BD²) = √(20²-16²) = √(400-256) = √144 = 12cm.
AC = √(AD²+CD²) = √(9²+12²) = √(81+144) = √225 = 15.
4x - 1 = 15 <=> 4x = 15 + 1 = 16 <=> x = 16 ÷ 4 = 4.