\(\left(3x+2\right)^2-\left(3x-2\right)^2=5x+38\)
\(\Leftrightarrow9x^2+12x+4-9x^2+12x-4=5x+38\)
\(\Leftrightarrow24x-5x=38\Leftrightarrow19x=38\Leftrightarrow x=2\)
\(\Rightarrow S=\left\{2\right\}\)
\(\left(3x+2\right)^2-\left(3x-2\right)^2=5x+38\\ \Leftrightarrow\left(3x+2+3x-2\right)\left(3x+2-3x+2\right)=5x+38\\ \Leftrightarrow6x\cdot4=5x+38\\ \Leftrightarrow24x=5x+38\\ \Leftrightarrow19x=38\\ \Leftrightarrow x=2\)
Chúc bạn học tốt nha
\(\left(3x+2\right)^2-\left(3x-2\right)^2=5x+38\)
\(\Rightarrow9x^2+12x+4-9x^2+12x-4-5x-38=0\)
\(\Rightarrow19x=38\)
\(\Rightarrow x=2\)
\(\left(3x+2\right)^2-\left(3x-2\right)^2=5x+38\)
\(\Leftrightarrow\left(3x+2+3x-2\right)\left(3x+2-3x+2\right)-5x=38\)
\(\Leftrightarrow24x-5x=38\)
\(\Leftrightarrow19x=38\)
\(\Leftrightarrow x=2\)
(3x+2)2 -(3x-2)2 =5x+38
9x2+12x+4-(9x2-12x+4)=5x+38
9x2+12x+4x-9x2+12x-4-5x-38=0
23x-32=0
x=32/23
