Question

Решить несложный пример.

Answer 1

р(х)=х-3
р(х-7)=х-3-7=х-10
р(2х)=2(х-3)=2х-6
2р(х-7)-р(2х)=2(х-10)-(2х-6)=2х-20-2х+6=-14

Answer 2

2P ( X - 7 ) - P ( 2X ) = ?
P ( X ) = X - 3 
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P ( X - 7 ) = X - 3 - 7 = X - 10 
2P ( X - 7 ) = 2X - 20 
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P ( 2X ) = 2 * ( X - 3 ) = 2X - 6 
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2X - 20 - ( 2X - 6 ) = 2X - 20 - 2X + 6 = - 20 + 6 = - 14 
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Ответ ( - 14 )