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 ( 45+ )
Otras preguntas
What is the permutations of the letters in the word football?
A grasshopper jumps off a tree stump. The height, in feet, of the grasshopper above the ground after t seconds is modeled by the function shown below. After how
The square root of 53 lies between which two numbers?
According to research by baltes and his colleagues, the time frame of ________ is the main age window for wisdom to emerge.
why are differences of people a good thing?
there are a total of 500 students in grades 1 through 5 in an elementary school. 17% of the total number of students are in 1st grade. 19% of the total number o
Wich cell organelle provides instructions to the golgi apparatus
What is 4,063 - (-1,396)
If a population consists of 100,000,000 people and a census is taken, how many people are sampled
solve this system of linear equations. 3x - 3y = 18 9x - 5y = 70
