journeyglass2005
journeyglass2005 journeyglass2005
  • 10-02-2021
  • Mathematics
contestada

The sum of the first n consecutive even numbers can be found using S=n2+n, where n≥2. What is the value of n when the sum is 42?

Question 8 options:

7


14


6


3

Respuesta :

mhanifa
mhanifa mhanifa
  • 10-02-2021

Answer:

  • C. 6

Step-by-step explanation:

Given

  • S = n² + n
  • S = 42, n = ?

Substitute and solve for n:

  • 42 = n² + n
  • n² + 2*1/2n + 1/4 = 42.25
  • (n + 0.5)² = 42.25
  • n + 0.5 = √42.25
  • n + 0.5 = 6.5
  • n = 6

Correct option is C

Answer Link
Аноним Аноним
  • 10-02-2021

Answer:

C. 6

Step-by-step explanation:

Answer Link

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