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x2−6x−y2+9=(x2−6x+9)−y2a,x2−6x−y2+9=(x2−6x+9)−y2
=(x−3)2−y2=(x−y−3)(x+y−3)
Chúc bạn học tốt nhé : ##Liz
x2 - 6x + 9 - y2
= ( x - 3 )2 - y2
= ( x - 3 - y )( x - 3 + y )
hk tốt
\(x^3+6x^2+11x+6=\left(x+1\right)\left(x+2\right)\left(x+3\right)\)
a)\(x^2+2xy-6y-9=x^2-9+2y.\left(x-3\right)=\left(x-3\right)\left(x+3\right)+2y.\left(x-3\right)\)
\(=\left(x-3\right).\left(x+3+2y\right)\)
b) \(x^3+x^2-6x=x^3-6x+9+x^2-9\)
\(=x^3+3x^2-3x^2-9x+3x+9+\left(x-3\right)\left(x+3\right)\)
\(=x^2.\left(x+3\right)-3x.\left(x+3\right)+3.\left(x+3\right)+\left(x-3\right).\left(x+3\right)\)
\(=\left(x+3\right).\left(x^2-3x+3+x-3\right)\)
\(=\left(x+3\right).\left(x^2-2x\right)=x.\left(x+3\right).\left(x-2\right)\)
a, \(x^2+2xy-6y-9\)
\(=\left(x^2+2xy+y^2\right)-\left(y^2+6y+9\right)\)
\(=\left(x+y\right)^2-\left(y-3\right)^2\)
\(=\left(x+2y-3\right)\left(x+3\right)\)
b, \(x^3+x^2-6x\)\(=x\left(x^2+3x-2x-6\right)\)
\(=x\left(x+3\right)\left(x-2\right)\)
\(^{=x^3-3x^2+5x^2-15x+9x-27}\)
\(=x^2\left(x-3\right)+5x\left(x-3\right)+9\left(x-3\right)\)
\(=\left(x-3\right)\left(x^2+5x+9\right)\)
\(x^3+2x^2-6x-27\)
\(=x^3+5x^2+9x-3x^2-15x-27\)
\(=x\left(x^2+5x+9\right)-3\left(x^2+5x+9\right)\)
\(=\left(x-3\right)\left(x^2+5x+9\right)\)
ts cld b lv ag
\(x^2-6x+9=\left(x-3\right)^2\)
\(4x^2-36=\left(2x-6\right)\left(2x+6\right)\)
\(8-x^3=\left(2-x\right)\left(4+2x+x^2\right)\)
Đề bạn ghi hơi khó hiểu~
a, x^2 - x - y^2 - y
= (x^2 - y^2) - ( x+ y)
= ( x- y)(x+y) - ( x+y )
= ( x - y - 1 )(x+ y)
b, x^2+ 6x + 9 - y^2
= ( x+ 3)^2 - y^2
= ( x+ 3 -y)( x + 3 +y)
a) x2 - 6x + 9 - 16 = x2 - 6x - 7 = x2 + x - 7x - 7 = x(x+1) - 7(x+1) = (x-7)(x+1)
b) x4 - 64 = (x2 - 8)(x2 + 8)
(x2 - 2.x.3 +32 ) - 42
(x-3)2 - 42
(x-3-4)(x-3+4)
b)
(x2)2 - 82
(x2-8)(x2+8)
\(x^2-y^2-6x+9=\left(x-3\right)^2-y^2=\left(x-3-y\right)\left(x+3+y\right)\)
\(x^4-27x=x\left(x^3-27\right)=x\left(x-3\right)\left(x^2+3x+9\right)\)
x2 + 6x + 9
= x2 + 2.3.x + 32
= (x + 3)2
`x^2 +6x+9`
`=x^2 + 2 . x . 3 + 3^2`
`= (x+3)^2`