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 ( 28+ )
Otras preguntas
How many Red Rings does the Red Ring of Death have? (A) = 1. (B) = 2. (C) = 3. (D) = 4.
_ _ _ _ _ _ _ _ _ is a sculpture that uses the land.
Why can you not prove a hypothesis
Whoever is first i will mark her/him brainliest and everyone free 100 points
wilde company earned revenues of $200,000 in cash and $130000 on account during 2018. of the $200,000 on account, $80,000 was collected in cash in 2018 and the
Who were known as the abolitionists? A. people who demanded the emancipation of slaves B. plantation owners of the southern colonies C. fugitive slaves who e
PLZZZZZZZZZZZZZZZ HELP! ¿Qué tiempo hace? Actividad #4: based on the following illustration indicate ¿Qué tiempo hace? In Spanish.
which ratio could be used to solve the following problem? ken drives his car 800 miles in 3 days, how far will he drive in 5 days?
i need help please anyone
growth. Birth rates, death rates, and migration rates are all parts of measuring A. population B. urban C. cultural D. educational Please select the best answer
