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Paul [167]
3 years ago
15

What is x+2=-x+-2? Can you plz do it step by step!

Mathematics
1 answer:
lapo4ka [179]3 years ago
6 0
To solve this equation, we are going to isolate the variable x.  To do this, we are going to begin by adding x to both sides because this will cancel out the negative x on the right side of the equation.

x + 2 + x = -x + x - 2
When we combine like terms, we get:
2x + 2 = -2
Next, we will try to continue to isolate the variable by subtracting 2 from each side to get the 2x term on the left by itself.
2x + 2 -2 = -2 -2 
When we combine like terms, we get:
2x = -4
Finally, to get x by itself we must divide by 2 to undo the multiplication of the coefficient of the term 2x.
2x/2 = -4/2
When we perform the division, we get:
x = -2
Therefore, x = -2.
We can check this answer by plugging it back into the original equation.  Our answer is verified because 0=0.
Your answer is that x = -2.
Hope this helps!
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The equation y=6.72(1.014) x models the world population y , in billions of people, x years after the year 2000 . Find the year
Marizza181 [45]

the population will reach 8 billion by 2012 ,as calculated by properties of logarithm.

<h3>What is Logarithm?</h3>
  • The opposite of exponentiation is the logarithm.
  • This indicates that the exponent to which a fixed number, base b, must be raised in order to obtain a specific number x, is represented by the logarithm of that number.
  • A number's natural logarithm is its logarithm to the base of the transcendental and irrational number e, which is roughly equivalent to 2.718281828459.

Given:

  • y = 6.72 ( 1.014^x), where
  1. y = population in billions
  2. x = time in years

To find: Year when population is 8 billion, i.e., y = 8.

Finding:

8 = 6.72  ( 1.014^x)

=> \frac{8}{6.72}= ( 1.014^x)

Taking log on both sides

=> log(\frac{8}{6.72})= log( 1.014^x)

=> log(1.19) = x (log 1.014) (as log_b(a)^m = m (log_b(a)) )

=> \frac{log(1.19)}{log (1.014)} = x

=> x = \frac{0.0755}{0.006}

=> x = 12.58

Hence, the population will reach 8 billion by 2012 ,as calculated by properties of logarithm.

To learn more about logarithms, refer to the link: brainly.com/question/25710806

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