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 ( 37+ )
Otras preguntas
There are 6 green apples and 5 red apples in a basket. (a) What is the ratio of red apples to all apples in the basket? (b) What is the ratio of all apples
Rosa has 3 3/4 pounds of dough. She uses 1/8 of a pound for one roll. How many rolls could be made from Rosa's dough?
HELP ME! TIMED HOMEWORK!!
According to the principles of FITT, what is the relation between the intensity of an exercise and the time an exercise needs to be performed?
Write using algebra. A movie theater has n rows and m seats in each row. If each ticket costs $5.60, how much do all tickets to one movie cost?
Participles are the only verbals that can be used to subordinate sentences. True False
A train leaves the station heading south on the tracks. It takes the train 5 seconds to reach 50 miles per hour. It completes the entire 100 mile trip in two ho
Let theta be an angle in quadrant IV such that sin theta= -5/13 Find the exact values of sec theta and tan theta
3x-y-3z if x=-2, y=1 and z=-2
X is a normally distributed random variable with a mean of 8 and a standard deviation of 4. the probability that x is between 1.48 and 15.56 is:
