agentkronus
agentkronus
02-03-2015
Mathematics
contestada
Find x when P = 21.
P = x(x - 1) / 2
Respuesta :
konrad509
konrad509
02-03-2015
[tex]21=\dfrac{x(x-1)}{2}\\ 42=x^2-x\\ x^2-x-42=0\\ x^2+6x-7x-42=0\\ x(x+6)-7(x+6)=0\\ (x-7)(x+6)=0\\ x=7 \vee x=-6[/tex]
Answer Link
VER TODAS LAS RESPUESTAS ( 77+ )
Otras preguntas
What was a major invention that caused massive casualties during the war?
A chemical is spilled in a grassy area. the chemical has been known to kill all bacteria that live in the soil. how will this most likely affect the area?
omar jogged a total of 3 3/5 miles last week. Each day that he jogged,he went 9/10 mile. On how many days did he jog?
find the follow of x 10/4=15/x
What is the best phrase which can be used then you hear "thank you"? It will be nice to get some explanation for using it.
What percent of 392 is 98
Professor skyler studies personality disorders and is most interested in people who are self-focused and exaggerate their own importance. people with this type
In a Cladogram ,when does a group of organisms break off?
Matrix question.....will pick brainiest Evaluate the Determinant [tex] \left[\begin{array}{ccc}X&1&-1\\X^2&X&X\\0&X&1\end{array}\right]
Which of the following is the flow of electrons through a wire or a conductor
