Question

Taman berbentuk persegi panjang berukuran panjang (3x-4) meter dan lebar (x+2) meter. jika keliling taman 36 meter, luas taman sebenarnya adalah....

Answer 1

Kll = 2p + 2l

36 = 2(3x-4) + 2(x+2)
36 = 6x-8+2x+4
36 = 6x+2x-8+4
36 = 8x-4
36+4=8x
40=8x
x= 40/8 = 5

L = p x l
=3(5)-4 X 2(5)[email protected]
=11 x 12
=132

Answer 2

Kl = 2p + 2l
36 = 2p + 2l
--------------------- : 2
18 = p + l
18 = 3x - 4 + x + 2
18 = 3x + x -4 +2
18 = 4x -2
18 + 2 = 4x
20 = 4x
x = 5

P = (3x - 4)
(15 - 4) = 11
L = (x + 2)
(5 + 2) = 7

Jadi luasnya: 11 x 7 = 77