Persegi panjang
[tex]p \times l = Luas \\ p \times (p - 3) = 270 \\ {p}^{2} - 3p - 270 = 0 \\ (p + 15)(p - 18) = 0 \\ panjang = 18 \: cm[/tex]
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Persegi panjang
[tex]p \times l = Luas \\ p \times (p - 3) = 270 \\ {p}^{2} - 3p - 270 = 0 \\ (p + 15)(p - 18) = 0 \\ panjang = 18 \: cm[/tex]