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\(x^8+3x^4+4\)
\(=\left(x^8-x^6+2x^4\right)+\left(x^6-x^4+2x^2\right)+\left(2x^4-2x^2+4\right)\)
\(=x^4\left(x^4-x^2+2\right)+x^2\left(x^4-x^2+2\right)+2\left(x^4-x^2+2\right)\)
\(=\left(x^4+x^2+2\right)\left(x^4-x^2+2\right)\)
\(4x^4+4x^3+5x^2+2x+1\)
\(=\left(4x^4+2x^3+2x^2\right)+\left(2x^3+x^2+x\right)+\left(2x^2+x+1\right)\)
\(=2x^2\left(2x^2+x+1\right)+x\left(2x^2+x+1\right)+\left(2x^2+x+1\right)\)
\(=\left(2x^2+x+1\right)^2\)
Đơn giản thôi :]>
Sau khi phân tích thì P(x) có dạng ( x2 + dx + 2 )( x2 + ax - 2 )
P(x) = x4 - x3 - 2x - 4 = ( x2 + dx + 2 )( x2 + ax - 2 )
⇔ x4 - x3 - 2x - 4 = x4 + ax3 - 2x2 + dx3 + adx2 - 2dx + 2x2 + 2ax - 4
⇔ x4 - x3 - 2x - 4 = x4 + ( a + d )x3 + adx2 + ( 2a - 2d )x - 4
Đồng nhất hệ số ta được :
\(\hept{\begin{cases}a+d=-1\\ad=0\\2a-2d=-2\end{cases}}\Leftrightarrow\hept{\begin{cases}a=-1\\d=0\end{cases}}\)
( x2 + dx + 2 )( x2 + ax - 2 )
= ( x2 + 2 )( x2 - x - 2 )
= ( x2 + 2 )( x2 - 2x + x - 2 )
= ( x2 + 2 )[ x( x - 2 ) + ( x - 2 ) ]
= ( x2 + 2 )( x - 2 )( x + 1 )
=> P(x) = x4 - x3 - 2x - 4 = ( x2 + 2 )( x - 2 )( x + 1 )
\(-x^4-x^3-2x^2+x-3\)
\(=-x^4-2x^3-3x^2+x^3+2x^2+3x-x^2-2x-3\)
\(=-x^2\left(x^2+2x+3\right)+x\left(x^2+2x+3\right)-\left(x^2+2x+3\right)\)
\(=\left(-x^2+x-1\right)\left(x^2+2x+3\right)\)
Trả lời:
x4 - 3x3 + 3x2 - x
= x ( x3 - 3x2 + 3x - 1 )
= x ( x - 1 )3
Ta có :
\(x^4-3x^3+3x^2-x\)
\(=x\left(x^3-3x^2+3x-1\right)\)
\(=x\left(x-1\right)^3\)
Vậy ..........
x4+2023x2+2022x+2023�4+2023�2+2022�+2023
=x4−x+2023x2+2023x+2023=�4-�+2023�2+2023�+2023
=(x4−x)+(2023x2+2023x+2023)=(�4-�)+(2023�2+2023�+2023)
=x(x3−1)+2023(x2+x+1)=�(�3-1)+2023(�2+�+1)
=x(x−1)(x2+x+1)+2023(x2+x+1)=�(�-1)(�2+�+1)+2023(�2+�+1)
=(x2+x+1)[x(x−1)+2023]=(�2+�+1)[�(�-1)+2023]
=(x2+x+1)(x2−x+2023)