a) \(3x+2\left(5-x\right)=-11\)
\(\Leftrightarrow3x+10-2x=-11\)
\(\Leftrightarrow x=-21\)
b) \(3x^2-3x\left(x-2\right)=36\)
\(\Leftrightarrow3x^2-3x^2+6x=36\)
\(\Rightarrow x=6\)
?????????????????????????????????????
3x + 2( 5 - x ) = -11
<=> 3x + 10 - 2x = -11
<=> x + 10 = -11
<=> x = -21
3x2 - 3x( x - 2 ) = 36
<=> 3x2 - 3x2 + 6x = 36
<=> 6x = 36
<=> x = 6
a)
\(3x+10-2x=-11\)
\(x+10=-11\)
\(x=-21\)
b)
\(3x^2-3x\left(x-2\right)=36\)
\(3x^2-3x^2+6x=36\)
\(6x=36\)
\(x=6\)
Bài làm :
\(\text{a)}3x+2\left(5-x\right)=-11\)
\(\Leftrightarrow3x+10-2x=-11\)
\(\Leftrightarrow x+10=-11\)
\(\Leftrightarrow x=-21\)
\(\text{b)}3x^2-3x\left(x-2\right)=36\)
\(\Leftrightarrow3x^2-3x^2+6x=36\)
\(\Leftrightarrow6x=36\)
\(\Leftrightarrow x=6\)