Seudónimo Seudónimo
  • 14-01-2022
  • Mathematics
contestada

Length of a rectangle is 7 less than 3 times it’s width. Area is 40cm^2. Find dimensions URGENT

Respuesta :

ihatebiologysm ihatebiologysm
  • 14-01-2022
x= width
length= 3x-7
Area: (x)(3x-7)=40
= 3x^2-7x=40
= 3x^2-7x-40=0
Factorise the equation: (3x+8)(x-5)=0
x=-8/3 (reject because width cannot be negative) or x=5
so width is 5cm and length is 3(5)-7= 8cm !
Answer Link

Otras preguntas

I’ve provided a picture im really STUCK
PLEASE HELP!!! like ASAP!!! A. X= 4B. X=-16C.X=16D.X=-4
Giant birds swoop down and carry away hikers who leave trash along a hiking trail. which theme would best match the monsters?
How does the point of view used in "Battling the Digital Jolly Roger" differ from "The Completely Free Market" and affect the reliability of the article?
Which is a likely reason that someone would harass a peer at school?
The image of a parabolic lens is traced onto a graph. The function f(x) = (x + 8)(x – 4) represents the image. At which points does the image cross the x-axis?
Which of the following has more inertia, bowling ball or tennis ball, hammer or feather?
Which best explains how the invention of corporations contributed to the economy in the 1800
Persons who are able to influence others and who possess managerial authority are termed
Anoche mi primo y yo _____ la canción nueva de Shakira por primera vez. A. oímos B. oyeron C. oí D. oyó