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60 = ( x + 5 ) ( x - 2 )
60 = x² + 5x - 2x - 10
60 = x² + 3x - 70
x² + 3x - 70 = 0²
x² + 10x - 7x -70 = 0
( x² + 10x ) - ( 7x - 70 ) = 0
x ( x + 10 ) -7 ( x + 10 ) = 0
( x - 7 ) ( x + 10 )
x = -7 , x = 10
Panjang AB = x + 5 lebar BC = x - 2
= 10 + 5 =10 - 2
= 15cm = 8cm
AC = AB² + BC²
= 15² + 8²
= 225 + 64
= 289
AC =√289
= 17cm