\(\left(2x-1\right)\left(x-5\right)-2x^2+10x-25=0\)
\(\Leftrightarrow2x^2-11x+5-2x^2+10x-25=0\)
\(\Leftrightarrow2x^2-2x^2-11x+10x=25-5\)
\(\Leftrightarrow-x=20\)
\(\Leftrightarrow x=-20\)
<=> 2x^2 - 11x + 5 - 2x^2 + 10x -25 =0
kết quả là 0
\(\left(2x-1\right)\left(x-5\right)-x^2-x^2+10x-25=0\)
\(\left(2x-1\right)\left(x-5\right)-x^2-\left(x-5\right)^2=0\)
\(\left(2x-x-x+5\right)\left(x-5\right)-x^2=0\)
\(\left(x+4\right)\left(x-5\right)-x^2=0\)
\(x^2-x-20-x^2=0\)
\(-x-20=0\Rightarrow x=-20\)
(2x-1)(x-5)-2x2+10x-25=0
<=>2x2-10x-x+5-2x2+10x-25=0
<=>-x-20=0
<=>-x=20
<=>x=-20
