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Question
pablo folds a straw into a triangle with side lengths of 4x² - 3 inches, 4x² - 2 inches, and 4x² - 1 inches. which expression can be used to find the perimeter of the triangle, and what is the perimeter when x = 1.5?
12x² - 6; 21 inches
12x²; 27 inches
12x² - 6; 30 inches
12x²; 36 inches
Step1: Encontrar la expresión del perímetro
El perímetro $P$ de un triángulo es la suma de las longitudes de sus lados. Entonces $P=(4x^{2}-3)+(4x^{2}-2)+(4x^{2}-1)$. Combinando términos semejantes: $P=(4x^{2}+4x^{2}+4x^{2})+(- 3-2 - 1)=12x^{2}-6$.
Step2: Calcular el perímetro para $x = 1.5$
Sustituir $x = 1.5$ en la expresión $12x^{2}-6$. Primero, $x^{2}=(1.5)^{2}=2.25$. Luego, $12x^{2}=12\times2.25 = 27$. Finalmente, $12x^{2}-6=27 - 6=21$ pulgadas.
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A. $12x^{2}-6$; 21 inches