Mathematics: The dimensions of a rectangle can be expressed as x + 3 and x - 8. If the area of the rectanlge is 60 square inches, what is the value of x?

The dimensions of a rectangle can be expressed

Ответ:

stephanieyingepbtcf8

28.01.2022

Mathematics

Step-by-step explanation:

Area of rectangle = product of dimensions

60 = (x + 3)(x - 8)

$x^2 + x(3 - 8) + 3 × -8 = 60 \\ x^2 - 5x - 24 = 60 \\ x^2 -5x -84 = 0 \\ x^2 - 12x + 7x - 84 = 0 \\ x(x - 12) + 7(x - 12) = 0 \\ (x + 7)(x - 12) = 0 \\ x = 12 or x = -7$

We cannot take x negative here , so x = 12

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Ответ:

jbrowley

24.06.2021

Mathematics

no se ingles así que no se pero te doy gracias por los puntos

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The dimensions of a rectangle can be expressed as x + 3 and x - 8. If the area of the rectanlge is 60 square inches, what is the value of x?

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