( 2x - 5) (x + 1 ) - 2 = (1 - x) (8 -2x ) +2x(x - 5) (x +2 ) -(3 - x ) (2 - x ) = x

Aleeks97 @Aleeks97

September 2018 2 11 Report

( 2x - 5) (x + 1 ) - 2 = (1 - x) (8 -2x ) +2x

(x - 5) (x +2 ) -(3 - x ) (2 - x ) = x - 12

Janek191

(2x - 5)(x +1) - 2 = (1 - x)(8 - 2x) + 2x

2x^2 + 2x - 5x - 5 - 2 = 8 - 2x - 8x + 2x^2 + 2x

2 x^2 -3x - 7 = 2 x^2 -8x + 8 / - 2 x^2

-3x - 7 = -8x + 8

-3x + 8x = 8 + 7

5x = 15 / : 5

x = 3

=========

(x -5)( x+ 2) - (3 - x)(2 - x) = x - 12

x^2 + 2x - 5x - 10 - ( 6 - 3x -2x + x^2 ) = x - 12

x^2 - 3x - 10 -6 + 5x - x^2 = x - 12

2x - 16 = x - 12

2x - x = - 12 + 16

x = 4

==========

3 votes Thanks 2

lewander0

$(2x\ -\ 5)(x\ +\ 1)\ -\ 2\ =\ (1\ -\ x)(8\ -\ 2x)\ +\ 2x\\ 2x^{2}\ +\ 2x\ -\ 5x\ -\ 5\ -\ 2\ =\ 8\ -\ 2x\ -\ 8x\ +\ 2x^{2}\ +\ 2x\\ 2x^{2}\ -\ 2x^{2}\ +\ 2x\ -\ 5x\ +\ 2x\ +\ 8x\ -\ 2x\ =\ 8\ +\ 5\ +\ 2\\ 5x\ =\ 15\ \ \ \ \ \ \ \ \ \ /5\\ x=3\\ \\ \\ (x-5)(x+2)-(3-x)(2-x)=x-12\\ x^{2} + 2x - 5x - 10 - 6 +3x + 2x -x^{2} = x - 12\\ x^{2} - x^{2} +2x - 5x + 3x + 2x - x = -12 + 10 + 6\\ x = 4$

2 votes Thanks 1

About Us

Life Enjoy

" Life is not a problem to be solved but a reality to be experienced! "

Recommend Questions

Life Enjoy

Get in touch

Social