Pertanyaan
Sebuah persegi panjang mempunyai (3x+4) dan (4x+-5). Jika keliling peesegi panjang tsb adalah 40 cm,maka luasnya?
Tolongg bantu pliss
Tolongg bantu pliss
Ditanyakan oleh: USER9184
146 Dilihat
146 Jawaban
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Jawaban (146)
Keliling = 40
2(3x+4+4x-5) = 40
2(7x -1) = 40
14x - 2 = 40
14x = 42
x = 42/14 = 3
panjang = 3x+4 = 3(3)+4 = 13 cm
lebar = 4x-5 = 4(3)-5 = 7 cm
Luas
= p × l
= 13 × 7
= 91 cm²
2(3x+4+4x-5) = 40
2(7x -1) = 40
14x - 2 = 40
14x = 42
x = 42/14 = 3
panjang = 3x+4 = 3(3)+4 = 13 cm
lebar = 4x-5 = 4(3)-5 = 7 cm
Luas
= p × l
= 13 × 7
= 91 cm²