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17 tháng 9 2017

a) \(3x^2-4y+4x-3y^2\)

\(=\left(3x^2-3y^2\right)-\left(4y-4x\right)\)

\(=3\left(x^2-y^2\right)-4\left(x+y\right)\)

\(=3\left(x-y\right)\left(x+y\right)-4\left(x+y\right)\)

\(=\left(x+y\right)\left(3\left(x-y\right)-4\right)\)

\(=\left(x+y\right)\left(3x-3y-4\right)\)

14 tháng 8 2017

\(\left(4x^2-7x-50\right)^2-16x^4-56x^3-49x^2\)

\(=\left(4x^2-7x-50\right)^2-\left(4x^2\right)^2-2.4x^2.7x-\left(7x\right)^2\)

\(=\left(4x^2-7x-50\right)^2-\left(4x^2-7x\right)^2\)

\(=\left(4x^2-7x-50-4x^2+7x\right)\left(4x^2-7x-50+4x^2-7x\right)\)

\(=-50\left(8x^2-14x-50\right)\)

\(=\left(4x^2-7x-50\right)^2-x^2\left(16x^2+56x+49\right)\)

\(=\left(4x^2-7x-50\right)^2-x^2\left(4x+7\right)^2\)

\(=\left(4x^2-7x-50-4x^2-7x\right)\left(4x^2-7x-50+4x^2+7x\right)\)

\(=\left(-14x-50\right)\left(8x^2-50\right)\)

\(=-4\left(7x+25\right)\left(2x-5\right)\left(2x+5\right)\)

13 tháng 9 2017

a,\(=x^3-x^2+5x^2-5x-24x+24\)

\(=x^2\left(x-1\right)+5x\left(x-1\right)-24\left(x-1\right)\)

\(=\left(x-1\right)\left(x^2+5x-24\right)\)

\(=\left(x-1\right)\left(x^2-3x+8x-24\right)\)

\(=\left(x-1\right)\left(x\left(x-3\right)+8\left(x-3\right)\right)\)

\(=\left(x-1\right)\left(x-3\right)\left(x+8\right)\)

13 tháng 9 2017

a)=(x-3)(x-1)(x+8)

b)=(x2+3x-1)2

22 tháng 5 2015

A=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

chỉnh lại tí

22 tháng 5 2015

Đặt P(x)=x4+6x3+7x2- 6x+1

Đặt y=x2-1

=>y2=x4-2x2+1

P(x)=x4-2x2+1+6x3-6x+9x2

  =(x2-1)2+6x(x2-1)+9x2

Q(y)=y2+6xy+9x2

=(y+3x)2

P(x)=(x2-1+3x)2

16 tháng 6 2017

a)\(3x^2-8x+4\)

\(=3x^2-2x-6x+4\)

\(=x\left(3x-2\right)-2\left(3x-2\right)\)

\(=\left(x-2\right)\left(3x-2\right)\)

b)\(4x^4+81\)

\(=4x^4+36x^2+81-36x^2\)

\(=\left(2x^2+9\right)^2-36x^2\)

\(=\left(2x^2-6x+9\right)\left(2x^2+6x+9\right)\)

c)\(x^8+98x^4+1\)

\(=\left(x^8+2x^4+1\right)+96x^4\)

\(=\left(x^4+1\right)^2+16x^2\left(x^4+1\right)+64x^4-16x^2\left(x^4+1\right)+32x^4\)

\(=\left(x^4+8x^2+1\right)^2-16x^2\left(x^4-2x^2+1\right)\)

\(=\left(x^4+8x^2+1\right)^2-16x^2\left(x^4-2x^2+1\right)\)

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

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

d)\(x^4+6x^3+7x^2-6x+1\)

\(=x^4+3x^3-x^2+3x^3+9x^2-3x-x^2-3x+1\)

\(=x^2\left(x^2+3x-1\right)+3x\left(x^2+3x-1\right)-\left(x^2+3x-1\right)\)

\(=\left(x^2+3x-1\right)\left(x^2+3x-1\right)\)\(=\left(x^2+3x-1\right)^2\)

14 tháng 10 2014

b = x.(x2 + 6x + 9 - 4y2 ) =x.((x+3)2 -4y2 )= x.(x+3-2y).(x+3+2y)

c = (x2 - 2x)+(2y-xy) = x.(x-2) +y.(2-x)= x.(x-2) + y.(-x+2)= x.(x-2) - y.(x-2) = (x-y).(x-2)

d = (x2 +1)2 - 4x2 = (x2 + 1 - 2x).(x2 +1 +2x) = (x-1)2 . (x+1)2

a = (7x)2 - (0.5y)  = (7x - 0,5y).(7x+0,5y)

14 tháng 8 2017

d) \(ax^2-5x^2-ax+5x+a-5=\left(ax^2-ax+a\right)+\left(-5x^2+5x-5\right)\)

\(=a\left(x^2-x+1\right)-5\left(x^2-x+1\right)=\left(a-5\right)\left(x^2-x+1\right)\)

e) \(ax-bx-2cx-2a+2b+4c=x\left(a-b-2c\right)-2\left(a-b-2c\right)\)

\(=\left(x-2\right)\left(a-b-2c\right)\)

14 tháng 8 2017

ax^2 - 5x^2-ax+5x+a-5

=x^2(a-5) -x(a-5)+(a-5)

=(a-5)(x^2-x+1)

ax-bx-2cx-2a+2b+4c

=x(a-b-c) -2(a-b-c)

=(x-2)(a-b-c)

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