Question

Persegi panjang mempunyai panjang ( 3x + 10 ) dan ( x + 10 ). Jika kelilingnya 144cm. maka panjang dan lebar persegi panjang tersebut adalah...

Answer 1

P = (3x + 10)
l = (x + 10)
K = 144 cm

2(p+l) = K
2(3x + 10 + x + 10) = 144
2(3x + x + 10 + 10) = 144
2 (4x + 20) = 144
8x + 40 = 144
8x = 144 - 40
8x = 104
x = 13

panjang = (3 × 13 +10) = 49
lebar = (x+10) = 13 + 10 = 23

Answer 2

144= 2( 3x+ 10 + x + 10 )
72 = 4x + 20
52 = 4x
x = 13

3(13) + 10 =
39 + 10 = 49

x + 10 =
( 13 ) + 10 = 23