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x² + 2x + 1 + x² - 4x + 4 = 225
2x² - 2x + 5 = 225
2x² - 2x = 220
x² - x = 110
x² -x - 110 = 0
(x - 11) (x+10) = 0
x = 11 dan x = -10
Yang diambil x = 11 krn x tdk boleh minus
p = x + 1= 11 + 1 = 12 cm
l = x - 2= 11 - 2 = 9 cm
L = pl
= 12 x 9
= 108 cm²