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lebarnya(4)cm,
5*5=25 cm
25 = √(3x + 3)² + x²
625 = 9x² + 18x + 9 + x²
625 = 10x² + 18x + 9
10x² + 18x - 616 = 0
5x² + 9x - 308 = 0
(5x + 44) (x - 7) = 0
x = 7
ket : x = -44/5 tidak mungkin karena negatif
maka panjang dan lebarnya berturut2 adalah
24 dan 7
luasnya
panjang dikali lebar
24 . 7 = 168 cm²
kelilingnya
2(panjang + lebar)
= 2(24 + 7) = 2(31) = 62 cm