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 ( 21+ )
Otras preguntas
The phrase "promote the general Welfare" in the Constitution refers to the idea that a. people are naturally selfish, and a government is necessary to keep orde
Calcium oxide (CaO) forms when an atom of calcium loses two electrons, giving it a +2 charge and an atom of oxygen picks up two electrons, giving it a -2 charge
what is the 10th term of the sequence:5,9,13,17
How are the circulatory systems in animals and plants alike? A. All plants and animals have a heart. B. Their circulatory systems move blood throughout the orga
what is the solution to the equation? 16+x-11=18-5
What did Napoleon do to bring back order in France?
wat would happen if both cold air masses had the same temperature
Which is a major function of diffusion in cells? A. to produce proteins B. to carry out mitosis C. to convert food into energy D. to get rid of waste material
Why does a compass needle point North?
For which of the following did President Theodore Roosevelt win the Nobel Prize in 1906? a. for building the Panama Canal b. for the Roosevelt Corollary c. for
