Para construir una caja a partir de una lámina de cartón cuadrada, se debe cortar cuadrados en las esquinas como se muestra la figura. De manera que el volumen de la caja está determinado por la expresión V = y. x2 Si el área de la lámina de cartón es de 400 cm2, entonces de acuerdo con la ecuación inicial, el volumen de la caja construida

Seleccione una:
a. es único, porque los valores de y, x se pueden hallar dada el área 400 cm2
b. es único, porque el área determina un único valor para x
c. varia, porque el volumen depende únicamente del valor de x y no del valor del área de la lámina
d. puede variar, así el área de la lámina sea constante

this is a very good question

step-by-step explanation:

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pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

i think the answer is d im not sure