Question

Rezolvati in R ecuatia:
a)2x+(3-6x)=-17
b)2(x+1)=3(x-1)
c)2x(x+1)=4-(1-2x)
d)15-x/6-2x+16/5=1

Answer 1

a) 2x+(3-6x)=-17
    2x+3-6x=-17
    -4x=-20
       x=5
b)2(x+1)=3(x-1)
   2x+2-3x+3=0
   -x=-5
    x=5
c)2x(x+1)=4-(1-2x)
   $2 x^{2} +2x-4+1-2x=0$
   $2 x^{2} =3$
    $x^{2} = \frac{3}{2}$
    |x|=$\sqrt{ \frac{3}{2} }$
   x=-$\sqrt{ \frac{3}{2} }$ sau x=$\sqrt{ \frac{3}{2} }$
d)15-$\frac{x}{6} -2x+ \frac{16}{5} =1$
    $- \frac{x}{6} -2x=1-15- \frac{16}{5}$
    $- \frac{13}{6}x=- \frac{86}{5}$
    x=$\frac{86}{5}$×$\frac{6}{13} = \frac{516}{65}$