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 ( 85+ )
Otras preguntas
Which is the best estimate of 59.4 × 0.28
Interested in learning more about its fans, the marketing office of the Arena Football League (AFL) conducted a survey at one of its games. The survey has 937 r
Which food truck has the absolute advantage? Frank’s Falafels Kimchi Kim’s Deli Delight Lunch on the Go
Which of the following are ways that humans have increased their carrying capacity.
why was the pax romana a successful time in roman history
Which is an implied power of the federal government? raising taxes regulating trade drafting soldiers declaring war
Why should you use an NDA when you outsource web development work to workers in remote locations?
According to ancient Egyptians, which of the following made the pleasures of life permanent for the dead? A. using multiple coffins B. illustrating scenes from
A ________ narrator can see and describe every character's thoughts. A first person B second person C third person, limited D third person, omniscient
Which property indicates how light is reflected from a mineral’s surface? cleavage density luster streak
