vadaoxendine1227 vadaoxendine1227
  • 13-04-2021
  • Mathematics
contestada

O número -3 é a raíz da equação x² - 7x - 2c = 0. Nessas condições, determine o valor do coeficiente c: A) 7 B) -2 C) -3 D) 15 E) NDA

Respuesta :

abidemiokin
abidemiokin abidemiokin
  • 15-04-2021

Responder:

c = 15

Explicação passo a passo:

se -3 é a solução para a expressão x² - 7x - 2c = 0, para obter c, vamos substituir x = -3 na equação (uma vez que é uma raiz)

x² - 7x - 2c = 0

(-3) ² - 7 (-3) - 2c = 0

9 + 21 - 2c = 0

30 - 2c = 0

30 = 2c

Trocar

2c = 30

c = 30/2

c = 15

Portanto, o valor de c é 15

Answer Link

Otras preguntas

"Atticus Finch is the sams in his house as he is in the public streets," What dows this statement suggest about Atticus Finch suggest about his character?
What's the difference between a formal and a vernacular region
What is the reason for the Oakes case in Canadian Law?
What is the force due to gravity on a 1500kg sumo restler?
A gym membership is advertised to cost $630 per year. What is the cost per month of the gym membership?
6. You are given an unknown type of clothing dye. How could you use the procedures in this lab to see if this dye is a mixture?
A major landmass on Earth's surface made of crustal rock is a _____. Select one: a. continent b. landform c. formation d. plate
There are 9 computers and 72 students. What is the unit rate of students to computers?
Help please? Number 6
Explain the role of the cell membrane during passive tranpsort and active transport