thu gọn đa thức sau : h(x)= 3-x^2(x+4)
Tìm nghiệm : a) (X+1)(X-2)(2x-4)
b)3x^2+x
c)x^2+2x
thu gọn đa thức sau : h(x)= 3-x^2(x+4)
Tìm nghiệm : a) (X+1)(X-2)(2x-4)
b)3x^2+x
c)x^2+2x
Câu 1:
` H(x) = 3 – x^{2}(x + 4) `
` <=> H(x) = -x^{3} – 4x^{2} + 3 `
Câu 2:
` a) ` ` (x + 1)(x – 2)(2x – 4) = 0 `
` => ` \(\left[ \begin{array}{l}x+1=0\\x-2=0\\ 2x-4=0\end{array} \right.\)
` => ` \(\left[ \begin{array}{l}x=-1\\x=2\end{array} \right.\)
` b) ` ` 3x^{2}+x = 0 `
` => x(3x + 1) = 0 `
` => ` \(\left[ \begin{array}{l}x=0\\3x+1=0\end{array} \right.\)
` => ` \(\left[ \begin{array}{l}x=0\\x=\frac{-1}{3}\end{array} \right.\)
` c) ` ` x^{2} + 2x = 0 `
` => x(x + 2) = 0 `
` => ` \(\left[ \begin{array}{l}x=0\\x=-2\end{array} \right.\)