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12x^3+16x^2-5x-3 = 12x3+18x2 -2x2-3x -2x -3
= 12x2(x +3/2) -2x(x+3/2) -2(x+3/2)
=(12x2-2x-2)(x+3/2)
=2(6x2-x-1)(x+3/2)
=2[6x(x+1/3)-3(x+1/3)](x+3/4)
=2(6x-3)(x+1/3)(x+3/4)
=6(2x-1)(x+1/3)(x+3/4)
1) \(\left(3x^2-3y^2\right)-\left(12x-12y\right)\)
\(=3xy\left(x-y\right)-12\left(x-y\right)\)
\(=\left(3xy-12\right)\left(x-y\right)\)
2) \(4x^3+4xy^2+8x^2y-16x\)
\(=\left(4x^3-16x\right)+\left(4xy^2+8x^2y\right)\)
\(=4x\left(x^2-4\right)+4xy\left(y+2x\right)\)
Ta có : 3x2 - 3y2 - 12x + 12y
= (3x2 - 3y2) - (12x - 12y)
= 3(x2 - y2) - 12(x - y)
= 3(x - y)(x + y) - 4.3.(x - y)
= 3(x - y)(x + y - 4)
Đặt A = 12x2 + 5x - 12y2 + 12y - 10xy - 3
= -(12x2 + 10xy + 3 -12x2 - 5x - 12y)
12y2 + 10xy + 3 - 12x2 - 5x - 12y
= 18xy + 12y2 - 6y - 12x2 - 8xy + 4x - 9x - 6y + 3
= 6y (3x + 2y - 1) - 4 . x (3x + 2y - 1) - 3 . (3x + 2y - 1)
= (6y - 4x - 3) . (3x + 2y - 1)
a) Ta có :\(x^3-3.x^2.2+3.x+2^2+2^3\)(Hằng đẳng thức số 5 đấy bạn)
=\(\left(x-2\right)^3\)
b) Ta có:\(x^2+5x+4=x^2+4x+1x+4\)
\(=\left(x^2+4x+4\right)+x\)
\(=\left(x+2\right)^2+x\)
c) Ta có :\(16x^2-9\left(x+1\right)^2=0\)
\(\left[4x+3\left(x+1\right)\right].\left[4x-3\left(x+1\right)\right]=0\)(Hằng đẩng thức số 3)
\(\left(4x+3x+3\right).\left(4x-3x-3\right)=0\)
\(7x+3.\left(x-3\right)=0\)
\(\Rightarrow7x+3=0\)hoặc \(x-3=0\)
\(\Rightarrow7x=-3\) hoặc \(x=0+3\)
\(\Rightarrow x=\frac{-3}{7}\) hoặc \(x=3\)
Vậy:\(x=\frac{-3}{7};3\)
d) Ta có \(x^3-2x^2-x+2\)
\(=\left(x^3-x\right)-\left(2x^2-2\right)\)
\(=x\left(x^2-1\right)-2\left(x^2-1\right)\)
\(=\left(x-2\right).\left(x^2-1\right)\)
Bây giờ hơi trễ rồi để mai mình làm tiếp 2 câu cuối nhá.
Rất vui khi được giúp bạn !!1 : =))
a,\(x^2+4x+3\)
=\(x^2+3x+x+3\)
=\(x\left(x+3\right)+\left(x+3\right)\)
=(x+3)(x+1)
b,\(2x^2+3x-5\)
=\(2x^2+5x-2x-5\)
=x(2x+5)-(2x+5)
=(2x+5)(x-1)
c,\(16x-5x^2-3\)
=\(-\left(5x^2-16x+3\right)\)
=\(-\left(5x^2-x-15x+3\right)\)
=-[x(5x-1)-3(5x-1)]
=-[(5x-1)(x-3)]
=-(5x-1)(x-3)
\(a.\) \(x^2+4x+3\)
\(=x^2+x+3x+3\)
\(=x\left(x+1\right)+3\left(x+1\right)\)
\(=\left(x+3\right)\left(x+1\right)\)
\(b.\) \(2x^2+3x-5\)
\(=2x^2-2x+5x-5\)
\(=2x\left(x-1\right)+5\left(x-1\right)\)
\(=\left(x-1\right)\left(2x+5\right)\)
\(c.\)\(16x-5x^2-3\)
\(=-5x^2+16x-3\)
\(=-5x^2+15x+x-3\)
\(=-5x\left(x-3\right)+\left(x-3\right)\)
\(=\left(x-3\right)\left(1-5x\right)\)
16x - 5x2 - 3 = -(5x2 - 16x + 3) = -(5x2 - 15x - x + 3) = -[5x(x - 3) - (x - 3)] = -(x - 3)(5x - 1)
16 - 5x2 - 3
= -5x2 + 15x + x - 3
= -5x(x - 3) + (x - 3)
= (1 - 5x)(x - 3)
16x-5x^2-3=-5x^2+15x+x-3=5x(3-x)-(3-x) =(3-x)(5x-1) (xy+1)^2-x^2-2xy-y^2=(xy+1)^2-(x^2+2xy+y^2) =(xy+1)^2-(x+y)^2 =(xy+1-x-y)(xy+1+x+y) =[(xy-x)-(y-1)][(xy+x)+(y+1)] =[x(y-1)-(y-1)][x(y+1)+(y+1)] =(y-1)(x-1)(y+1)(x+1)
= (12x^3-6x^2)+(22x^2-11x)+(6x-3)
= (2x-1).(6x^2+11x+3)
= (2x-1).[(6x^2+2x)+(9x+3)]
= (2x-1).(3x+1).(2x+3)
k mk nha
Ta có: \(12x^3+16x^2-5x-3\)
\(=12x^3-6x^2+22x^2-11x+6x-3\)
\(=6x^2\left(2x-1\right)+11x\left(2x-1\right)+3\left(2x-1\right)\)
\(=\left(2x-1\right)\left(6x^2+11x+3\right)\)
\(=\left(2x-1\right)\left(6x^2+9x+2x+3\right)\)
\(=\left(2x-1\right)\left(2x+3\right)\left(3x+1\right)\)