Question

Sebuah persegi panjang berukuran panjang (2×+5)m dan lebar (2n-3),jika.keliling 36m selesaikan dan tentukan panjanh dan lebar?

Answer 1

K = 2 (p + l)
36 = 2 {(2x + 5) + (2x-3)}
36 = 2 {2x + 5 + 2x - 3}
36 = 2 {4x + 2}
18 = 4x + 2
18 - 2 = 4x
16 = 4x
x = 16 : 4 = 4

substitusi :
p = 2x + 5
p = 2(4) + 5
p = 8 + 5 = 13

l = 2x - 3
l = 2(4) - 3
l = 8 - 3 = 5

Answer 2

36 = 2 ( 2x + 5 + 2x - 3 )
18 = 4x + 2
4x = 16
  x = 4

Panjang :
( 2x + 5 ) m = ( 8 + 5 ) m = 13 m

Lebar :
( 2x - 3 ) m = ( 8 - 3 ) m = 5 m