2.(x+5) - x2 - 5x = 0
2(x+5) - x(x+5) = 0
(x+5)(2-x) = 0
=> x+5=0 hoặc 2-x=0
=> x=-5 hoặc x=2
2.(x+5) - x2 - 5x = 0
2(x+5) - x(x+5) = 0
(x+5)(2-x) = 0
=> x+5=0 hoặc 2-x=0
=> x=-5 hoặc x=2
5/ Tim x,y,z biet
a/x^2+2y^2+2xy-2y+1=0
b/5x^2+3y^2+2^2-4x+6xy+4z+6=0
tim x biet 3x^2-5x+2=0
tim x,biet:
a)x(x-2)+x-22=0
b)5x(x-3)-x+3=0
tim x biet 16-5x^2-3=0
tim x biet: x. (5x-4) - 5(x2+8) + 10x = 12
a; Xac dinh a; b de phep chia sau la phep chia het : 5x4+5x3+x2+11x+a chia het cho x2+x+b .Tim thuong voi a; b tim duoc ?
b; Tim x biet : x4-30x2+31x-30=0
Tim x biet
a) 28x^3+15x^2+75x+125=0
b)4x^2-x-5=0
Phan tich da thuc thanh nhan tu
a) x^3+5x^2+3x-9
b)x^3-7x-6
c)3x^3-7x^2+17x-5
Tim x biet
a) 28x^3+15x^2+75x+125=0
b)4x^2-x-5=0
Phan tich da thuc thanh nhan tu
a) x^3+5x^2+3x-9
b)x^3-7x-6
c)3x^3-7x^2+17x-5
tim x biet x^2*(x-2)+x*(-3+2x)-5x=7