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( x + 3 ) . ( x - 5 ) = 0
\(\Rightarrow\orbr{\begin{cases}x+3=0\\x-5=0\end{cases}\Rightarrow\orbr{\begin{cases}x=-3\\x=5\end{cases}}}\)
Vậy x = -3 hoặc x = 5
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Vậy, 7x + 36 = 12 - x
=> 8x + 36 = 12
<=> x = (12 -36) ÷ 8 = -3
\(2\left(x+3\right)-4x=48\)
\(=>2x+6-4x=48\)
\(=>-2x=48-6\)
\(=>-2x=42\)
\(=>x=-21\)
Lệ Tự Nguyên Hào sai rồi nha
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4x - 15 = - 75 - x
=> 4x + x = - 75 + 15
=> 5x = - 50
=> x = -10
Vậy x = -10
2x . ( x - 3 ) = 0
\(\Rightarrow\orbr{\begin{cases}2x=0\\x-3=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=0\\x=3\end{cases}}\)
Vậy \(x\in\left\{0;3\right\}\)
Học tốt
K cần tk
4.x-15=-75-x <=> 5.x=-60 <=> x=-12
2.x.(x-3)=0 <=> x=0 hoặc x-3=0
<=>x=0 hoặc x=3
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7 - x - 1 = 3x + 14
=>4x + 15 = 7
=>4x = -8
=> x = -8 : 4 = -2
7-(x+1)=3x+14
7-(x+1)-14=3x
-7-(x+1)=3x
-7=3x+x+1
-7-1=4x
-8=4x
x=-8/4=-2
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(x - 5) x (x - 7) = 0
=> x - 5 = 0 => x =5
hoặc x - 7 = 0 => x=7
........
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2.(3-6x)+8.(x-5)=-42
2.3-2.6x+8.x-8.5=-42
6-2.6x+8.x-40=-42
2.6x+8.x-40=6-(-42)
2.6x+8.x-40=48
2.6x+8x=48+40
2.6x+8x=88
12x+8x=88
x.(12+8)=88
x20=88
x=88/20
x=4,4
<=> 8x - 24 = 0
<=> 8x= 24
+. x = 3
8.(x-3)=0
x-3=8.0
x-3=0
x =0+3
x = 3