\(\dfrac{1}{4}x^2-\left(\dfrac{1}{2}x-4\right)\dfrac{1}{2}x=-14\)
\(\Rightarrow\dfrac{1}{4}x^2-\left(\dfrac{1}{4}x^2-2x\right)=-14\)
\(\Rightarrow\dfrac{1}{4}x^2-\dfrac{1}{4}x^2+2x=-14\)
\(\Rightarrow x=-7\)
Chúc bạn học tốt!!!
\(\dfrac{1}{4}x^2-\left(\dfrac{1}{2}x-4\right)\cdot\dfrac{1}{2}x=-14\)
\(\Leftrightarrow\dfrac{1}{4}x^2+\left(-\dfrac{1}{2}x+4\right)\cdot\dfrac{1}{2}x=-14\)
\(\Leftrightarrow\dfrac{1}{4}x^2-\dfrac{1}{4}x^2+2x=-14\)
\(\Leftrightarrow2x=-14\)
\(\Leftrightarrow x=-7\)
Vậy \(x=-7\)
\(\dfrac{1}{4}x^2-\left(\dfrac{1}{2}x-4\right).\dfrac{1}{2}x=-14\)
\(\Rightarrow\dfrac{1}{4}x^2-\dfrac{1}{4}x^2+2x=-14\)
\(\Rightarrow2x=-14\)
\(\Rightarrow x=-14:2\)
\(\Rightarrow x=-7\)
Vậy \(x=-7.\)
