6x^2-7x-20
Phân tích thành nhân tu
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(6x^2+7x+2\\ =6x^2+3x+4x+2\\ =3x\left(2x+1\right)+2\left(2x+1\right)\\ =\left(3x+2\right)\left(2x+1\right)\)
\(x^4+6x^3+7x^2-6x+1\)
\(=x^4+6x^3+9x^2-2x^2-6x+1\)
\(=\left(x^2\right)^2+2.x^2.3x+\left(3x\right)^2-2\left(x^2+3x\right)+1\)
\(=\left(x^2+3x\right)^2-2\left(x^2+3x\right).1+1^2\)
\(=\left(x^2+3x-1\right)^2\)
Chúc bạn học tốt.
\(x^4+6x^3+7x^2-6x+1\)
\(=x^4+6x^3+9x^2-2x^2-6x+1\)
\(=x^2\left(x+3\right)^2-2\left(x^2+3x\right)+1\)
\(=\left(x^2+3x\right)^2-2\left(x^2+3x\right)+1=\left(x^2+3x-1\right)^2\)
x^4+6x^3+7x^2–6x+1
=x^4+(6x^3–2x^2)+(9x^2–6x+1)
= x^4+2x^2(3x–1)+(3x–1)^2
=(x^2+3x–1)^2
\(x^4-6x^3+7x^2-6x+1\)
\(=x^4+x^2+1-6x^3+6x^2-6x\)
\(=\left(x^2+1\right)^2-x^2-6x\left(x^2-x+1\right)\)
\(=\left(x^2+x+1\right)\left(x^2-x+1\right)-6x\left(x^2-x+1\right)\)
\(=\left(x^2-x+1\right)\left(x^2+x+1-6x\right)\)
\(=\left(x^2-x+1\right)\left(x^2-5x+1\right)\)
= x4 - x3 + x2 - 5x3 + 5x2 - 5x + x2 - x +1 = x2 ( x2 - x +1 ) - 5x ( x2 - x +1 ) + x2 - x +1 = ( x2 - x +1 ) ( x2 - 5x + 1 )
x4+6x3+7x2-6x+1
=(x4-2x2+1)+(6x3-6x)+9x2
=(x2-1)2+6x(x2-1)+9x2
=(x2-1).(x2-1+6x)+9x2
=(x2+3x-1)2
x4+6x3+7x2-6x+1
=(x4-2x2+1)+(6x3-6x)+9x2
=(x2-1)2+6x(x2-1)+9x2
=(x2-1). (x2-1+6x)+9x2
=(x2+3x-1)2
\(6x^2-7x+2=6x^2-3x-4x+2=3x\left(2x-1\right)-2\left(2x-1\right)=\left(3x-2\right)\left(2x-1\right)\)
Đúng cho mình nhe
7x - 6x2 - 2
= - ( 6x2 - 7x + 2)
= - ( 6x2 - 3x - 4x + 2 )
= - [ 3x ( 2x - 1 ) - 2 ( 2x - 1 ) ]
= - ( 2x - 1 ) ( 3x - 2 )
~ Học tốt ~
\(7x-6x^2-2=\left(3x-6x^2\right)+\left(4x-2\right)=3x\left(1-2x\right)-2\left(1-2x\right)=\left(1-2x\right)\left(3x-2\right)\)
6x2-7x-20
= 6x2-15x+8x-20
= 3x(2x-5) + 4(2x-5)
= ( 2x-5 )(3x+4)
<=> x= 5/2 hoặc x= -4/3
Vậy .........