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Matematika SMP
Diketahui
Persegi panjang
p = 3x + 7 (dalam cm)
l = 2x + 5 (dalam cm)
Keliling = 64 cm
Ditanya
Ukuran panjang dan lebar
Penyelesaian
Keliling = 2(p + l)
2[3x + 7 + 2x + 5] = 64
5x + 12 = 32
5x = 20
x = 4
Ukuran
Panjang = 3(4) + 7
∴ Panjang = 19 cm
Lebar = 2(4) + 5
∴ Lebar = 13 cm