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 ( 44+ )
Otras preguntas
a Norfolk pine is 18 inches tall and grows at a rate of 1.5 feet per year
16/60 fraction in simplest form
16/60 fraction in simplest form
Certain gases in the atmosphere trap heat on Earth.What is the name of phenomenon?The Greenhouse effectGlobal warmingGlacial meltingCooling period
Who was Pericles? A. a Greek speaker whose fame eventually spread far and wide B. the leader who developed the strategies leading to Greek naval success C. the
Order from greatest to least 2.007; 2.714; 2.09; 2.97
26-4=12+ missing number
There are 32 female performers in a dance recital. The ratio of men to women is 3:8. How many men are in the dance recital?
Are the angles with the given measures complementary, supplementary, or neither? m∠R = 43° and m∠S = 57° A. complementary B. supplementary C. neither
-2=-6x+1 what is the slope intercept form for this question
