bài 1 phân tích
a)x^2-7x+6
b)4x^2+10x+4
c)x^3+27+(x+3)(x-9)
d)3x(x-1)-1+x
e)x+y+x^2+y^2
f)(x-2)^2-9
g)6x^2-x-7
h)10x^2-15x-2
bài 2 tìm x
a)(2x-1)^2-25=0
b)x(x+1)-x-1=0
c)x^3-8+(x-2)(3-2x)=0
d)x^2+4-12=0
e)x^2+2x-8=0
f)x^2-5x-14=0
g)12x^2+7x-12=0
h)15x^2+7x-2=0
i)x^2+6x+5=0
k)x^2-5x-14=0