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 ( 43+ )
Otras preguntas
Ruben brought 6 comic books for $21. What was the coast for 1 comic book?
HELPPPPPPPP Lisa bought 5 CDs from a store. The price of each CD was the same. After she bought the CDs, her account balance showed a change of −$64.95. What wo
Green hybrid auto corporation pays its executives an excessive amount relative to what lower-level employees at the company receive and to what executives at co
(8x+3z-8z^2)+(4y-5z)
How to do no1 and 2 ?
In the reaching beyond our borders box titled "golden arches glowing across the globe," mcdonald's, the largest food franchise in the world, continues to tweak
Bella cell costs $18 per moth plus 0.15 for every minute she uses the phone. Last moth her bill was$20.25. For how many minutes did she use her phone last month
How good are you at judging people? What would you do if you encountered someone you thought evil?
PLEASE HELP ASAP!!!!
How would you describe her hair? Look at the picture and choose the correct sentence
