Question

Va rog ajutați-mă 4(x+1)•(3x+7)=0 , -2(x-15)=0

Answer 1

4 × ($\displaystyle{x}$ + 1) × (3$\displaystyle{x}$ + 7) = 0

(4$\displaystyle{x}$ + 4) × (3$\displaystyle{x}$ + 7) = 0

Cazul 1:

4$\displaystyle{x}$ + 4 = 0

4$\displaystyle{x}$ = -4

$\displaystyle{x}$ = (-4) : 4

$\boxed{x=-1}$

Cazul 2:

3$\displaystyle{x}$ + 7 = 0

3$\displaystyle{x}$ = -7

$\displaystyle{x=\frac{7}{3}}$

-2 × ($\displaystyle{x}$ - 15) = 0

-2$\displaystyle{x}$ + 30 = 0

-2$\displaystyle{x}$ = -30

2$\displaystyle{x}$ = 30

$\displaystyle{x}$ = 30 : 2

$\boxed{x=15}$

- Lumberjack25