Question

DIK : P= (3x - 2) cm
L= (x+3) cm
K= 42 cm
Dit : x ....?
Jwb:

Answer 1

K = 2p + 2l
42= 2(3x-2) + 2(x+3)
42= 6X-4 + 2x+6
42= 6x+2x + (-4)+6
42= 8X + 2
42-2 = 8x
40 = 8x
x = 40/8
x=5

maaf kalo slah

Answer 2

K = 2(p + l)
42 = 2 ( 3x - 2 + x + 3)
 42 = 2 ( 4x + 1)
42 = 8x + 2
42 - 2 = 8x
 40 = 8x
 40 : 8 = x
 5 =x
jadi, x = 5

 maaf kalau salah..