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Verified answer
Materi: Bangun DatarDiketahui:
p = 2 + l, dan misalkan p×l = A sehingga
(p+3)×(l+3) = A + 51
(l+5)×(l+3)= pl + 51 = (2+l)(l)+51
l^2 + 8l + 15 = 2l + l^2 + 51
6l + 36 = 0
l = 6 cm.
Jadi, lebar awalnya adalah 6 cm