Panjang suatu persegi panjang adalah (2x+4)cm, dan lebarnya 40(2×-1)cm, jika kelilingnya 70 cm, hitung lah luas persegi panjang?
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2(p+l) = 70
p+l = 70:2
p+l = 35
2x+4+4(2x-1) = 35
2x+4+8x-4 = 35
10x = 35
x = 3,5
maka,
p = 2x+4 = 2(3,5)+4 = 7+4 = 11 cm
l = 4(2x-1) = 4(2.3,5 - 1) = 4(7-1) = 4.6 = 24 cm
jadi,
Luas
= p x l
= 11 x 24
= 264 cm²