Question

Tìm nghiệm của mỗi đa thức sau 

B(x)= 2.(x-1)+3.(2-x)

C(x)= 8x³ -2x

Answer 1

cho B(x) = 0

\(=>2\left(x-1\right)+3\left(2-x\right)=0\)

\(2x-2+6-3x=0\)

\(4-x=0\)

\(x=4\)

cho C(x) = 0

\(=>8x^3-2x=0\)

\(2x^3.4-2x=0\)

\(2x\left(4x^2-1\right)=0\)

\(=>\left[{}\begin{matrix}2x=0\\4x^2=1\end{matrix}\right.=>\left[{}\begin{matrix}x=0\\x^2=\dfrac{1}{4}=>\left[{}\begin{matrix}x=\dfrac{1}{2}\\x=-\dfrac{1}{2}\end{matrix}\right.\end{matrix}\right.\)

Answer 2

tk

https://hoc24.vn/hoi-dap/page-4?subject=1#:~:text=tr%C6%B0%E1%BB%9Bc%20(22%3A29)-,cho%20B(x)%20%3D%200,2,-%3D%3E%5B2