Question

Tìm x

a) x (3x - 2) - 3x (x + 5) = - 34

b) (2x + 3) . (3x - 2) - 6x . (x - \(\frac{1}{2}\))  = 26

Answer 1

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!

Answer 2

a) \(\Leftrightarrow x=2\)

b) \(\Leftrightarrow x=32\div8=4\)

Hk tốt

Answer 3

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 \(x=4\)