Question

3 ( 2x+1) (-X+3) - (2x+5)^2= -[-{-3(Х+5)} + 10x^2

Answer 1

Respuesta:

3(2x+1)(-x+3) - (2x+5)2 = -[ - { -3(x+5) } + 10x2]

 

(6x+3)(-x+3) - (2x+5)(2x+5) = -[ - { -3x-15 } + 10x2]

 

(-6x2 + 15x + 9) - (4x2 + 20x + 25) = -[ 3x + 15 + 10x2]

 

-6x2 + 15x + 9 - 4x2 - 20x - 25 = -3x - 15 - 10x2

 

-10x2 - 5x - 16 = -3x - 15 - 10x2

 

-5x - 16 = -3x - 15

 

-5x = -3x + 1

 

-2x = 1

 

x = -1/2

Explicación paso a paso: