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p = 2x - 20
l = x - 10
L = p × l
200 = (2x - 20) (x - 10)
200 = 2x² - 20x - 20x + 200
0 = 2x² - 40x + 200 - 200
0 = 2x² - 40x
0 = 2x(x - 20)
2x = 0
x = 0
x - 20 = 0
x = 20
p = 2x - 20
= 2(20) - 20
= 40 - 20
= 20 cm
l = x - 10
= 20 - 10
= 10 cm
Jadi panjang dan lebarnya berturut-turut adalah 20 cm dan 10 cm.
200 = (2x-20) x (x - 10)
200 = 2x²-20x-20x+200
200 = 2x²-40x+200
2x²-40x+200-200 = 0
2x²-40x = 0
2x (x - 20) = 0
x = 20
panjang = 2(20)-20 = 20 cm
lebar = (20) -10 = 10 cm