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 ( 16+ )
Otras preguntas
what is the first step in solving the quadratic equation x2 = 9/16 ? take the square root of both sides of the equation. add 9/16 to both sides of the equation.
How did the Industrial Revolution bring changes to the landscape of Europe? A. Towns and cities grew quickly. B. Farms increased in size. C. People mo
While waiting for a video game to download, you notice that 30%, percent of 32,000 kilobytes have been downloaded so far. How many kilobytes have been downloade
what is 27 is what % of 60?
Which form does a verb take when the subject receives the action?
order these numbers from least to greatest. 8420 , −0.45 , 17 , −818
what does abolition mean? a. universal voting rights b. the end of slavery c. the rise of technology d. a belief in oneself
which function increases at a faster rate on 0 to infinity, f(x) = x2 or g(x) = 2x? explain your reasoning
what is the solution of the system of equations? y = –5x 6 y = –3x – 4 a. (–1.25, 12.25) b. (–19, 5) c. (–1, –1) d. (5, –19)
when a sentence begins with two prepositonal phrases joined by word and, where should the writer place a comma?
