Question

Rezolvati in R ecuatiile:3radical din 2 +7=0
16x-3(x+1)=5x
2,5(x-4)-6x=3-x
x-3x-10=0
2x+7x-8=0
-x+10x+2=0
VA ROOG

Answer 1

$\displaystyle a).16x-3(x+1)=5x \\ 16x-3x-3=5x \\ 16x-3x-5x=3 \\ 8x=3 \\ x= \frac{3}{8}$

$\displaystyle b).2,5(x-4)-6x=3-x \\ 2,5x-10-6x=3-x \\ 2,5x-6x+x=3+10 \\ -2,5x=13 \\ x=- \frac{13}{2,5} \\ x=-5,2$

$\displaystyle c).x-3x-10=0 \\ x-3x=0+10 \\ -2x=10 \\ x=- \frac{10}{2} \\ x=-5$

$\displaystyle d).2x+7x-8=0 \\ 2x+7x=0+8 \\ 9x=8 \\ x= \frac{8}{9}$

$\displaystyle e).-x+10x+2=0 \\ -x+10x=0-2 \\ 9x=-2 \\ x=- \frac{2}{9}$