\(4x^2+4x-81y^2+1=\left(4x^2+4x+1\right)-81y^2\)
\(=\left(2x+1\right)^2-81y^2=\left(2x+9y+1\right)\left(2x-9y+1\right)\)
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\(4x^2+4x-81y^2+1=\left(4x^2+4x+1\right)-81y^2\)
\(=\left(2x+1\right)^2-81y^2=\left(2x+9y+1\right)\left(2x-9y+1\right)\)
4x^2+4x-81y^2+1
( 4x^2 +4x +1/ 4x^2 -1 ) - ( 2/2x-1) -3
4x^2-y^2+4x+1
4x^2-4y^2+4x+1
phân tích đa thức thành nhân tử
a/4x-4y+x^2-2xy+y^2
b/x^4-4x^3-8x^2+8x
c/x^3+x^2-4x-4
d/x^4-x^2+2x-1
e/x^4+x^3+x^2+1
f/x^3-4x^2+4x-1
Bài 1: Tìm x biết a) x^3 - 4x^2 - x + 4= 0 b) x^3 - 3x^2 + 3x + 1=0 c) x^3 + 3x^2 - 4x - 12=0 d) (x-2)^2 - 4x +8 =0
a) (4x-3)(4x+3)-(3x+1)^2=7x^2+8
tìm GTNN
A=(x^2 -3x+1) . (x^2-3x-2) +2018
B=(x-1)(x+5)(x^2+4x+5)=2018
C=15-4x^2+4x
D=(x-1)(x-3)=21