Phân tích đa thức sau thành tích: \(x^2-14x+13\)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.


x4+2.x3-13.x2-14x+24
=x3.(x+2)-13x2+12x-26x+24
=x3.(x+2)-x.(13x-12)-2.(13x-12)
=x3.(x+2)-(13x-12)(x+2)
=(x+2)(x3-13x+12)
=(x+2)(x3-x-12x+12)
=(x+2)[x.(x2-1)-12.(x-1)]
=(x+2)[x.(x-1)(x+1)-12.(x-1)]
=(x+2)(x-1)[x.(x+1)-12]
=(x+2)(x-1)(x2+x-12)
=(x+2)(x-1)(x2-3x+4x-12)
=(x+2)(x-1)[x.(x-3)+4.(x-3)]
=(x+2)(x-1)(x-3)(x+4)

\(x^4-6x^3+12x^2-14x+3\)
= \(x^4-4x^3+x^2-2x^3+8x^2-2x+3x^2-12x+3\)
= \(x^2\left(x^2-4x+1\right)-2x\left(x^2-4x+1\right)+3\left(x^2-4x+1\right)\)
= \(\left(x^2-4x+1\right)\left(x^2-2x+3\right)\)

\(x^4-14x^2-7x+30=\left(x^4+x^3-3x^2\right)+\left(-x^3-x^2+3x\right)+\left(-10x^2-10x+30\right)\)
\(=x^2\left(x^2+x-3\right)-x\left(x^2+x-3\right)-10\left(x^2+x-3\right)\)
\(=\left(x^2+x-3\right)\left(x^2-x-10\right)\)

Bài làm
3x2 + 14x - 15
= 3x2 + 9x + 5x - 15
= -( 9x - 3x2 ) - ( 15 - 5x )
= -3x( 3 - x ) - 5( 3 - x )
= ( 3 - x )( -5 - 3x )
# Hokc tốt #

Vô đây xem: bài 1:phân tích đa thức thành nhân tửa)7x^3y-14x^2y+7xy^3b)3x^2-3xy-5x+5yc)x^2+7x+12giúp mình với - Hoc24
Phân tích đa thức sau thành phần tử:
\(a,2x^2-14x\\ b,\left(x^2-2x+1\right):\left(x-1\right)12+5x=8\)



\(x^3-9x^2+14x\)
= \(x^3-7x^2-2x^2+14x\)
= \(x^2.\left(x-7\right)-2x.\left(x-7\right)\)
= \(\left(x-7\right).\left(x^2-2x\right)\)
= \(\left(x-7\right).\left(x-2\right).x\)
\(x^3-9x^2+14x\)
\(=x\left(x^2-9x+14\right)\)
\(=x\left(x^2-7x-2x+14\right)\)
\(=x\left[x\left(x-7\right)-2\left(x-7\right)\right]\)
\(=x\left(x-2\right)\left(x-7\right)\)


Nhẩm nghiệm của đa thức trên ta thấy \(x^2-14x+13=0\) khi x=1
Thực hiện chia đa thức trên cho x-1 ta có
\(x^2-14x+13=\left(x-1\right)\left(x-13\right)\)
\(x^2-14x+13=x^2-13x-x+13=x\left(x-13\right)-\left(x-13\right)=\left(x-1\right)\left(x-13\right)\)