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zhuklara [117]
3 years ago
14

X,y and z are three consecutive even numbers if y^2 - 2 = 2x + 5Z find x,y and z​

Mathematics
2 answers:
Sindrei [870]3 years ago
8 0

Answer:

6, 8, 10

Step-by-step explanation:

x, y, z

y=x+2, z= x+4

  • y²- 2= 2x+5z
  • (x+2)²- 2= 2x+ 5(x+4)
  • x²+4x+4-2= 2x+5x+20
  • x²-3x-18=0

Solving the quadratic equation we get:

  • x=6, then y= 8, z= 10
  • x= -3 discarded as odd number

Rama09 [41]3 years ago
6 0

Answer:

6, 8, 10

Step-by-step explanation:

x y and z are three consecutive even numbers

it means that you can write y = x + 2

and z = y + 2 = x + 4

so

  y^2-2=2x+5z\\  (x+2)^2-2=2x+5(x+4)\\x^2+4x+4-2=2x+5x+20

  x^2+4x+2=7x+20\\x^2+4x+2-7x-20=0\\x^2-3x-18=0\\(x+3)(x-6)=0(x=-3\ or \ x=6)

so the solutions are

x = 6

y = 8

x = 10

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At the start of 2015, the population was growing at 8.39 million people per year.

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To find the population growing at the start of 2015 we say t = 1

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The estimated standard deviation from the range rule is 145.5 cm3.As it is 29.8 cm3 smaller than the exact standard deviation, we consider that the estimation is not accurate enough.

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