Question

Diketahui sebuah persegi panjang dengan panjang (3x+2) cm & lebar (2x-1)cm.Jika keliling persegi panjang 32cm,maka ukuran lebarnya adalah...cm

Answer 1

Keliling = 2(p+l)
32 = 2 (3×+2+2×-1)
32 = 2 (5×+1)
32 = 10× +2
10× = 32-2
10× = 30
× = 30/10
× = 3

lebar = 2×-1
= 2×10 -1
= 20 - 1
=19

Answer 2

K = 2 (p+l)
   = 2 ( (3x+2) + (2x-1) )
   = 2 (5x + 1)
   = 10x + 2
32 = 10x + 2
32 - 2 = 10x
30 = 10x
x = 30/10
x = 3

Maka,
Panjang = 3x + 2 = 3.3 + 2 = 9 + 2 = 11
Lebar = 2x - 1 = 2.3 - 1 = 6 - 1 = 5

Semoga Membantu.....