c, x⁴+6x³+11x²+6x+1
=x⁴+6x³+9x²+2x²+6x+1
=x⁴+9x²+1+6x³+2x²+6x
=(x²)²+(3x)²+1²+2.x².3x+2.x².1+2.3x.1       (1)
Áp dụng hằng đẳng thức (a+b+c)²=a²+b²+c²+2ab+2ac+2bc
=> (1)=(x²+3x+1)²

Câu a nhé bạn:
a,   3x²−22xy−4x+8y+7y²+1
=3x²-21xy-xy-3x-x+7y+y+7y²+1
=(3x²−21xy−3x)−(xy-7y²-y)−(x-7y-1)
=3x(x−7y−1)−y(x−7y−1)−(x−7y−1)
=(3x−y−1)(x−7y−1)

Cho mk hs bn Diệu Thúy để lm đc như câu a) thì có pp j k bn? Hay chỉ lag ngồi nhóm lại thôi hả bn? Trả lời nhanh dùm mk nha😘

1) \(x^2-6x+3\)

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

\(=\left(x-3\right)^2-6\)

\(=\left(x-3+\sqrt{6}\right)\left(x-3-\sqrt{6}\right)\)

2) \(2m^2+10m+8\)

\(=2m^2+2m+8m+8\)

\(=2m\left(m+1\right)+8\left(m+1\right)\)

\(=\left(2m+8\right)\left(m+1\right)\)

\(=2\left(m+4\right)\left(m+1\right)\)

3) \(9x^2+6x-8\)

\(=\left(9x^2+6x+1\right)-9\)

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

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

4) \(x^3-5x^2-14x\)

\(=x\left(x^2-5x-14\right)\)

\(=x\left(x^2-2x+7x-14\right)\)

\(=x\left[x\left(x-2\right)+7\left(x-2\right)\right]\)

\(=x\left(x+7\right)\left(x-2\right)\)

1) x^2-6x+3

= (x^2-6x+9)-6

=(x-3)^2-6

=(x-3-căn 6)(x-3+căn 6)

2) =2(m^2+5m+4)

=2(m+1)(m+4)

3) =9x^2+6x+1-9

=(3x+1)^-9

=(3x-2)(3x+4)

4, x^3-5x^2-14x

=x(x-7)(x+2)

5, a^4+4a^2-5

=a^4+4a^2+4-9

=(a^2+2)^-9

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

6, x^3-7x-6

=(x-3)(x+1)(x+2).

5) \(a^4+4a^2-5\)

\(=a^4+5a^2-a^2-5\)

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

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

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

6) \(x^3-7x-6\)

\(=x^3-x-6x-6\)

\(=x\left(x^2-1\right)-6\left(x+1\right)\)

\(=x\left(x-1\right)\left(x+1\right)-6\left(x+1\right)\)

\(=\left(x+1\right)\left(x^2-x-6\right)\)

\(=\left(x+1\right)\left(x^2+2x-3x-6\right)\)

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

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

Ok

Mình không giảnh để trả lời câu hỏi này