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Vadim26 [7]
3 years ago
10

If a number is doubled and then increasa30 the result is five less then three times number find the number

Mathematics
1 answer:
valkas [14]3 years ago
8 0

Answer:

  8

Step-by-step explanation:

Let n represent the number.

  2n+3 . . . . "doubled, then increased by 30"

  3n -5 . . . . "five less than three times the number"

These two results are equal, so we have ...

  2n +3 = 3n -5

  8 = n . . . . . . . . . . add 5-2n

The number is 8.

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Answer:

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I like to put these in the form f(x) = 0. We can do that by subtracting the right side. Common factors can be cancelled from numerator and denominator, provided they are not zero.

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If you leave the numerator as (x-3)(4-x), then there are two values of x that make it zero. Because x=3 makes the equation "undefined", it cannot be considered to be a solution.

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