Question

Suatu persegi panjang, panjangnya (3x-2) cm dan lebar (x+5) cm.a. tentukan keliling yg ditanya dlm. b.jika kel 62 cm berapannilai x. c.tentukan panjang dan lebar persegi itu?? x

Answer 1

P = 3x - 2
l = x + 5

soal a
K = 2(p + l)
= 2(3x - 2 + x + 5)
= 2(3x + x -2 +5)
= 2(4x + 3)
= 8x + 6

soal b
K = 8x + 6
62 = 8x + 6
62 - 6 = 8x
56 = 8x
x = 56/8
x = 7

soal c
p = 3x - 2
p = 3.7 - 2
p = 21 - 2
p = 19 cm

l = x + 5
l = 7 + 5
l = 12 cm

Answer 2

A.(8x-6)
b.x=7
c.p=19;l=12