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vovikov84 [41]
3 years ago
6

A number increased by fifteen is nineteen. A number increased by fifteen is nineteen.

Mathematics
1 answer:
elixir [45]3 years ago
5 0

Answer:

the number is 4

Step-by-step explanation:

we can write this as

x + 15 = 19

now we transpose

x= 19-15

x= 4

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Ten times an integer is added to seven times it’s square. If the result is 152, what was the original number?
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Answer:

Required number is 4.

Step-by-step explanation:

Let the required number be a.

Given,

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= > Ten times of a + seven times of it's square = 152

= > 10( a ) + 7( a )^2 = 152

= > 10a + 7a^2 - 152 = 0

= > 7a^2 + 10a - 152 = 0

= > 7a^2 + ( 38 - 28 )a - 152 = 0

= > 7a^2 + 38a - 28a - 152 = 0

= > a( 7a + 38 ) - 4( 7a + 38 ) = 0

= > ( a - 4 )( 7a + 38 ) = 0

= > a = 4 or - 38 / 7

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