Question

1. suatu persegipanjang mempunyai panjang (2x + 3) cm dan lebar (x - 2) cm.
a. tentukan rumus utk kelilingnya!
b. jika kelilingnya 26 cm, hitung panjang & lebar persegipanjang tsb!

jawab pakai caranya yaa.. makasih

Answer 1

A. 2{(2X + 3) + (X - 2)}
b. 26 = 2{(2X + 3) + (X - 2)}
26 = 2 (3X + 1)
26 = 6x + 2
26-2= 6X
24 = 6x
x = 24/6
x = 4
jd pnjang = 2x+3 = 2×4 + 3= 11
lebr = X-2= 4-2 =2

Answer 2

A) Rumus Keliling = 2(p + l)
= 2(2x + 3 + x - 2)
= 2(3x + 1)
= 6x + 2

b) 26 = 6x + 2
   24 = 6x
   x = 4
panjang = 2(4) + 3 = 11 cm
lebar = 4 - 2 = 2 cm