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horsena [70]
3 years ago
11

Doblando un alambre de 40 cm formamos un rectángulo. Hallar la expresión algebraica que define el área del rectángulo y calcula

su valor para x=4.
Mathematics
1 answer:
Lady bird [3.3K]3 years ago
5 0

Answer:

A = 128\,cm^{2}

Step-by-step explanation:

El área del rectángulo se halla a través de la siguiente fórmula: (The area of the rectangle is obtained by the following formula:)

A = (40\,cm - 2\cdot x)\cdot x

Donde el área y x se miden en centímetros cuadrados y centímetros, respectivamente. (Where area and x are measured in square centimeters and centimeters, respectively)

Ahora, x se reemplaza y se encuentra el valor numérico del área: (Now, x is substituted and numerical value of area is finally determined:)

A = [40\,cm - 2\cdot (4\,cm)]\cdot (4\,cm)

A = 128\,cm^{2}

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