sebuah persegi panjang mempunyai ukuran panjang (3x + 5) cm dan keliling (10x + 8)cm.Jika Lebarnya 7cm, nilai x =..

Keliling = 2p + 2l
10x + 8 = 2(3x+5) +2.7
10x + 8 = 6x + 10 + 14
10x + 8 = 6x + 24
10x -6x = 24-8
4x = 16
X = 4

Panjang = (3x + 5) cm
Keliling = (10x + 8) cm
Lebar = 7 cm

Keliling = 2(p + l)
10x + 8 = 2(3x + 5 + 7)
10x + 8 = 2(3x + 12)
10x + 8 = 6x + 24
10x - 6x = 24 - 8
4x = 16
x = 16 / 4
x = 4