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 ( 54+ )
Otras preguntas
Someone help me with this math question!!
The diameter of a circle that has an area of 452.16 mm
What. Is a A beam. Of.light becomes more spread out as
What was brought into america during the triangular trade?
x-4y=-18 Graphing Linear Equations in 2 Variables
A preliminary design, a detail design, and a report on the work done on these are created during the ________ phase of the sdlc.
Jake used an employment agency to find him a new job. Jake has agreed to pay the agency a commission equal to 4% of his first year's salary. If the agency find
Why was the magna carta significant to the development of democratic government?
Why does Lovborg NOT want to go to Judge Brack's party? He wants to be working on his book with Thea. He fears that he will drink. He wants to be with Hedda. He
PLEASE HELP How many lines of symmetry does the image have? 0 1 2 4
