Question

tỉm x 

5x(1-2x)-3x(x+18)=0

nhanh mình tick

Answer 1

      \(5x\left(1-2x\right)-3x\left(x+18\right)=0\)

\(\Leftrightarrow5x-10x^2-3x^2-54x=0\)

\(\Leftrightarrow-13x^2-49x=0\)

\(\Leftrightarrow-x\left(13x-49\right)=0\)

\(\Rightarrow\hept{\begin{cases}-x=0\Leftrightarrow x=0\\13x-49=0\Leftrightarrow x=\frac{49}{13}\end{cases}}\)

Vậy \(x=0\)hoặc \(x=\frac{49}{13}\)

Answer 2

5 (1-2x) - 3x(x+18) = 0

5x - 10x² - 3x ²- 54x = 0

- 13x² - 49x = 0

(-13x - 49)x = 0

TH1

:x = 0

TH2:

-13x - 49 = 0

-13x         = 49

     x         = -49/13

vậy x = 0 và x = -49/13