4x4 - 21 x2y2 + y4
= (4x4 + 4x2y2 + y4) - 25x2y2
= [(2x2)2 + 2x2 . 2 . y2 + (y2)2] - 25x2y2
= (2x2 + y2) - 25x2y2
= (2x2 + y2 - 5xy) (2x2 + y2 + 5xy)
phan tich cac da thuc sau thanh nhan tu a)x^2+4x+3 b) 4x^2+4x-3 c) x^2-x-12 d)4x^4+4x^2y^2-8y^4
phan tich da thuc thanh nhan tu: 4x^4-32x^2+1
Phan tich da thuc thanh nhan tu (x²+3x)^2+7x²+21x+10
Phan tich da thuc thanh nhan tu : x2 - 4x -y2+4
Phan tich da thuc thanh nhan tu x^2(1-x^2)-4-4x^2
phan tich da thuc thanh nhan tu : 4x^4+4x^3+5x^2 +2x +1
4x^4+4x^3+5^2+2x+1
phan tich da thuc thanh nhan tu
phan tich da thuc thanh nhan tu
x^2(1-x^2)-4-4x^2
phan tich da thuc thanh nhan tu 4x^2-y^2+8(y-2)
