a) x (3x - 2) - 3x (x + 5) = - 34
<=> 3x2-2x-3x2-15x=-34
<=>-17x=-34
<=>x=\(\frac{-34}{-17}\)
<=>x=2
b) (2x + 3) . (3x - 2) - 6x . (x - \(\frac{1}{2}\) ) = 26
<=>6x2-4x+9x-6-6x2 +3x=26
<=>8x=26+6=32
<=>x=32:8=4
nếu đúng nhớ k cho mk và kết bn nha!mk trả lời nhanh nhất đó. thank. chúc bn học tốt!
a) \(\Leftrightarrow x=2\)
b) \(\Leftrightarrow x=32\div8=4\)
Hk tốt
a)\(x\left(3x-2\right)-3x\left(x+5\right)=-34\)
\(\Leftrightarrow3x^2-2x-3x^2-15x=-34\)
\(\Leftrightarrow15x-2x=-34\)
\(\Leftrightarrow13x=-34\)
\(\Leftrightarrow x=\frac{-34}{13}\)
b) \(\left(2x+3\right)\left(3x-2\right)-6x\left(x-\frac{1}{2}\right)=26\)
\(\Leftrightarrow6x^2+5x-6-6x^2+3x=26\)
\(\Leftrightarrow8x-6=26\)
\(\Leftrightarrow8x=26+6\)
\(\Leftrightarrow8x=32\)
\(\Leftrightarrow x=32\div8\)
\(\Leftrightarrow x=4\)
Vậy \(x=4\)
