\(\left(2x+1\right)^2+\left(5-4x\right)\left(x+3\right)\)
\(=4x^2+4x+1+5x+15-4x^2-12x\)
\(=-3x+16\)
(2x+1)^2+(5−4x)(x+3)
=4x^2+4x+1+5x+15−4x^2−12x
=−3x+16
Tìm x biết:
a) (3x + 5)2 - 4x2 = 0
b) 25x4 - (4x - 3)2 = 0
c) (3x + 7)2 - (2x - 3)2 = 0
d) (4x - 1)2 - (5 - 3x)2 = 0
1.PTDTTNT
a)(2x+1)*(x+1)^2*(2x+3)-18
b) (x^2+4x+3)*(x^3+12x+35)+15
c0(x-3)*(x-5)*(x-6)*(x-10)-24x^2
Phân tích đa thức thành nhân tử:
1). (x - 3)(x - 1) - 3(x - 3)
2). (6x + 3) - (2x - 5)(2x + 1)
3). (x - 1)(2x + 1) + 3(x - 1)(x + 2)(2x + 1)
4). (3x - 2)(4x - 3) - (2 - 3x)(x - 1) - 2(3x - 2)(x + 1)
5). \(\left(x-5\right)^2+\left(x+5\right)\left(x-5\right)-\left(5-x\right)\left(2x+1\right)\)
6). (a - b)(a + 2ab) - (b - a)(2a - b) - (a - b)(a + 3b)
1.phân tích đa thức thành nhân tử
a) 4x3-8x2=4x
b)(2-5x)(2x+1)- (2-5x)
c)x2 - x +y-y2
d) 4x2 - 25
e)3x2-7x+4
f)(x-y)(x-5)-x2+2xy-y2
2.tìm x
a)x3 - 3x2 =0
b)2(5-x)-3x(x-5)=0
c)9x2=(2x-1)2
3. tìm GTLN
A=5/x2-2x+5
2. Tìm x, biết:
a) 2x2 + 3x = 0
b) (2x + 1)(x-2) - 5(1-2x) = 0
c) x2 = (2x -1)2
d) 4x3 - x = 0
bài 1: phân tích đa thức thanh nhân tử
1) x2 - 2x - 4y2 - 4y 2) x4 + 2x3 - 4x - 4 3) x3 +2x2y -x - 2y
4) 3x2 - 3y2 - 2(x - y)2 5) x3 - 4x2 -9x + 36 6) x2 - y2 - 2x - 2y
7) (3x-1)2 - 16 8) (5x - 4)2 - 49x2 9) (2x +5) - (x-9)2
tìm x:
5(x+3)-2x(3+x)=0
4x(x-2004)-x+2004=0
(x+1)^2=x+1
