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Ta có: 2x(x – 5) – x(3 + 2x) = 26
⇔ 2x2 – 10x – 3x – 2x2 =26
⇔ - 13x = 26
⇔ x = - 2
\(2x\left(x-5\right)-x\left(3+2x\right)=26\)
\(\Leftrightarrow2x^2-10x-3x-2x^2=26\)
\(\Leftrightarrow-13x=26\)
\(\Leftrightarrow x=-2\)
Bài làm:
Ta có: \(2x\left(x-5\right)-x\left(3+2x\right)=26\)
\(\Leftrightarrow2x^2-10x-3x-2x^2-26=0\)
\(\Leftrightarrow-13x=26\)
\(\Rightarrow x=-2\)
Ta có: 2x(x – 5) – x(3 + 2x) = 26
⇔ 2 x 2 – 10x – 3x – 2 x 2 =26
⇔ - 13x = 26
⇔ x = - 2
\(2x\left(x-5\right)-x\left(3+2x\right)=26\)
\(\Leftrightarrow\left(2x^2-10x\right)-\left(3x+2x^2\right)=26\)
\(\Leftrightarrow-13x=26\)
\(\Leftrightarrow x=-2\)
a, 2x(x-5) - x ( 3 + 2x ) = 26
=> 2x^2 - 10x - 3x - 2x ^ 2 = 26
=> - 13 x = 26
=> x = -2
a, \(2x\left(x-5\right)-x\left(3+2x\right)=26\)
\(\Leftrightarrow2x^2-10x-3x-2x^2=26\)
\(\Leftrightarrow-13x=26\)
\(\Leftrightarrow x=-2\)
Vậy x = -2
b, \(3x^3-48x=0\)
\(\Leftrightarrow3x\left(x^2-16\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}3x=0\\x^2-16=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=0\\x=4;x=-4\end{cases}}\)
Vậy x = 0 hoặc x = 4 hoặc x = -4
x(2x - 3) - 2(3 - 2x) = 0
x(2x - 3) + 2(2x - 3) = 0
(2x - 3)(x + 2) = 0
\(\left[\begin{array}{nghiempt}2x-3=0\\x+2=0\end{array}\right.\)
\(\left[\begin{array}{nghiempt}x=\frac{3}{2}\\x=-2\end{array}\right.\)
2x(x - 5) - x(3 + 2x) = 26
2x2 - 10x - 3x - 2x2 = 26
- 13x = 26
x = - 26 : 13
x = - 2
a, 2x ( x - 5 ) -x ( 3 + 2x ) = 26
=> 2x^2 - 10x - 3x - 2x^2 = 26
=> -13x = 26
=> x = -2
b, ( x - 7) ( x - 5 ) - x ( x + 2 )= 4
=> x^2 - 12x + 35 - x^2 - 2x = 4
=> -14x = -31
=> x = 31/14
\(a,2x\left(x-5\right)-x\left(3+2x\right)=26\)
\(\Leftrightarrow2x^2-10x-3x-2x^2=26\)
\(\Leftrightarrow-13x=26\)
\(\Leftrightarrow x=-2\)
\(\Rightarrow S=\left\{-2\right\}\)
\(b,\left(x-7\right)\left(x-5\right)-x\left(x+2\right)=4\)
\(\Leftrightarrow x^2-5x-7x+35-x^2-2x-4=0\)
\(\Leftrightarrow-14x+31=0\)
\(\Leftrightarrow-14x=-31\)
\(\Leftrightarrow x=\frac{31}{14}\)
\(\Rightarrow S=\left\{\frac{31}{14}\right\}\)
b) Ta có: 2x(x – 5) – x(3 + 2x) = 26
⇔ 2x2x2 – 10x – 3x – 2x2x2 =26
⇔ - 13x = 26
⇔ x = - 2
2x(x-5) - x(3+2x) = 26
<=> 2x^2 - 10x - 3x - 2x^2 = 26
<=> -13x=26
<=> x = -2
2x(x-5) - x (3+2x) = 26
=> 2x2 - 10x - 3x - 2x2 = 26
=> (2x2 - 2x2) + (-10x - 3x) = 26
=> -13x = 26
=> x = 26 : (-13)
=> x = -2