Question

Suatu persegi panjang mempunyai ukuran panjang (3x+4)cm & lebar (2x+3)cm. jika keliling persegi panjang 44cm, maka panjang & lebarnya bertirut-turut adalah.........................

Answer 1

Keliling persegi panjang = 2 (P + L)
= 2 (3x + 4 + 2x + 3)
= 2 (5x + 7)
= 10x + 14

10x + 14 = 44
10x = 44 - 14
10x = 30
x = 30 / 10
x = 3

panjang = 3x + 4
= 3(3) + 4
= 9 + 4
= 13 cm

lebar = 2x + 3
= 2(3) + 3
= 6 + 3
= 9 cm

Answer 2

44 = 2 ( 3x + 4 + 2x + 3 ) , 44 = 6x + 8 + 4x + 6 , 44 - 8 - 6 = 6x + 4x , 30 = 10x , 30/10 = x , 3 = x , panjang = 3.3 + 4 = 13 cm , lebar = 2.3 + 3 = 9 cm