- ( x/2 + 3) ( 5- 6x) + ( 12x - 2) ( x/4+ 3) = 0
- ( x^2 + 2x +4) ( 2-x) + x( x-3) ( x+4) -x^2 + 24= 0
1/ [tex](\frac{x}{2}+3).(5-6x)+(12x-2)(\frac{x}{4}+3)=0[/tex]
<=> [tex]\frac{x+6}{2}.(5-6x)+\frac{x+12}{4}.(12x-2)=0[/tex]
<=> [tex]\frac{5x+30}{2}-\frac{6x^2+36x}{2}+\frac{12x^2+144x}{4}-\frac{2x+24}{4}=0[/tex]
<=> [tex]\frac{10x+60-12x^2-72x+12x^2+144x-2x-24}{4}=0[/tex]
<=> 80x + 36 = 0
<=> x = [tex]\frac{-9}{20}[/tex]
2/ [tex]( x^2 + 2x +4) ( 2-x) + x( x-3) ( x+4) -x^2 + 24= 0[/tex]
<=> [tex]-x^3 +8 + x^3+x^2 -12x -x^2 + 24= 0[/tex]
<=> 12x = 32
<=> x=[tex]\frac{8}{3}[/tex]