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A figura mostra um terreno retangular
A figura mostra um terreno retangular de 15 m por 25 m. Nesse terreno, há um jardim de forma também retangular que tem dois lados consecutivos contornados por uma calçada.
A calçada ocupa uma área de 168 m2. Assim, uma equação que permite calcular corretamente o valor de x é:
a) 3×2 – 90x + 168 = 0.
b) x2 – 30x + 69 = 0.
c) 3×2 – 90x – 207 = 0.
d) x2 – 30x – 125 = 0.
e) 3×2 – 90x + 375 = 0.
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