PhÂN TÍCH ĐA THỨC THÀNH NHÂN TỬ:
\(a^4-9a^3+81a-81\)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a^2-9a^3+81a-81\)
Phân tích đa thức thành nhân tử:
\(-\left(9a^3-a^2-81a+81\right)\)
\(9a^3-13a+6=\left(9a^3-6a^2\right)+\left(6a^2-4a\right)-\left(9a-6\right)=3a^2\left(3a-2\right)+2a\left(3a-2\right)-3\left(3a-2\right)=\left(3a-2\right)\left(3a^2+2a-3\right)\)
\(x^4-4x^3+8x+3=\left(x^4+x^3\right)-\left(5x^3+5x^2\right)+\left(5x^2+5x\right)+\left(3x+3\right)=x^3\left(x+1\right)-5x^2\left(x+1\right)+5x\left(x+1\right)+3\left(x+1\right)=\left(x+1\right)\left(x^3-5x^2+5x+3\right)=\left(x+1\right)\left[\left(x^3-3x^2\right)-\left(2x^2-6x\right)-\left(x-3\right)\right]=\left(x+1\right)\left(x-3\right)\left(x^2-2x-1\right)\)
\(A=b^4-9a^2-4b^2+4=b^4-4b^2+4-9a^2\)
\(=\left(b^2-2\right)^2-9a^2\)
\(=\left(b^2-2+3a\right)\left(b^2-2-3a\right)\)
\(A=b^4-9a^2-4b^2+4\)
\(A=\left(b^2\right)^2-2.2.b^2+2^2-9a^2\)
\(A=\left(b^2-2\right)^2-\left(3a\right)^2\)
\(A=\left(b^2-2-3a\right)\left(b^2-2+3a\right)\)
_Hắc phong_
a) \(x^4-4x^{3^{ }}+8x+3\)
\(=\left(x^4+x^3\right)-\left(5x^3+5x^2\right)+\left(5x^2+5x\right)+\left(3x+3\right)\)
\(=x^{3^{ }}\left(x+1\right)-5x^{2^{ }}\left(x+1\right)+5x\left(x+1\right)+3\left(x+1\right)\)
\(=\left(x+1\right)\left(x^3-5x^2+5x+3\right)\)
\(=\left(x+1\right)\left[\left(x^3-3x^2\right)-\left(2x^2-6x\right)-\left(x-3\right)\right]\)
\(=\left(x+1\right)\left[x^2\left(x-3\right)-2x\left(x-3\right)-\left(x-3\right)\right]\)
\(=\left(x+1\right)\left(x-3\right)\left(x^2-2x-1\right)\)
\(=\left(x+1\right)\left(x-3\right)\left[\left(x-1\right)^2-2\right]\)
\(=\left(x+1\right)\left(x-3\right)\left(x-1-\sqrt{2}\right)\left(x-1+\sqrt{2}\right)\)
b, \(x^2\left(y^2-4\right)^2-6x\left(y^2-4\right)+9\)
\(=\left[x\left(y^2-4\right)-3\right]^2\)
\(=\left(xy^2-4x-3\right)^2\)
\(=\left(4x^2-9\right)^2=\left(2x-3\right)^2\left(2x+3\right)^2\)
=a4-81-(9a3-81a)
=(a2-9)(a2+9) -9a(a2-9)
=(a2-9)(a2-9a+9)
ĐẾN ĐÂY MÌNH CHỊU ,BẠN GIẢI TIẾP NHA