(4x - 3)2 - 3x(3 - 4x) = 0
<=> (4x - 3)2 + 3x(4x - 3) = 0
<=> (4x - 3)(4x - 3 + 3x) = 0
<=> (4x - 3)(7x - 3) = 0
<=> x = 3/4 hoặc x = 3/7.
E lm đc mỗi 1 câu :((
\(\left(4x-3\right)^2-3x\left(3-4x\right)=0\)
\(\left(4x-3\right)^2-3x\cdot\left(-1\right)\cdot\left(4x-3\right)=0\)
\(\left(4x-3\right)^2+3x\cdot\left(4x-3\right)=0\)
\(\left(4x-3\right)\left(4x-3+3x\right)=0\)
\(\left(4x-3\right)\left(7x-3\right)=0\)
\(\orbr{\begin{cases}4x-3=0\\7x-3=0\end{cases}}\)
\(\orbr{\begin{cases}x=\frac{3}{4}\\x=\frac{3}{7}\end{cases}}\)
\(3x\left(x-4\right)-x\left(5+3x\right)=-34\)
\(3x^2-12x-5x-3x^2+34=0\)
\(-17x+34=0\)
\(x=2\)
( 4x - 3 )2 - 3x( 3 - 4x ) = 0
⇔ ( 4x - 3 )2 + 3x( 4x - 3 ) = 0
⇔ ( 4x - 3 )( 4x - 3 + 3x ) = 0
⇔ ( 4x - 3 )( 7x - 3 ) = 0
⇔ 4x - 3 = 0 hoặc 7x - 3 = 0
⇔ x = 3/4 hoặc x = 3/7
3x( x - 4 ) - x( 5 + 3x ) = -34
⇔ 3x2 - 12x - 5x - 3x2 = -34
⇔ -17x = -34
⇔ x = 2
