1) 6x4-11x2+3
2) x4+3x2-4
3) 3x4+4x2+1
4) x4+x2-20
5) 4x-37x+9
6) (x2+x)2+4(x2+x)-12
Help me!!!!!!!!!
3.$3x^4+4x^2+1=3x^4+3x^2+x^2+1=3x^2(x^2+1)+x^2+1=(x^2+1)(3x^2+1)$
2,$x^4+3x^2-4=x^4-x^2+4x^2-4=x^2(x^2-1)+4(x^2-1)=(x^2-1)(x^2+4)$
1.$6x^4-11x^2+3=6x^4-2x^2-9x^2+3=2x^2(3x^2-1)-3(3x^2-1)=(2x^2-3)(3x^2-1)$
4,$x^4+x^2-20=x^4-4x^2+5x^2-20=x^2(x^2-4)+5(x^2-4)=(x^2-4)(x^2+5)$
6) Biểu thức = $ (x^{2} + x)  + 4(x^{2} + x ) -12$
Đặt t = $ x^{2} + x (*)$
Biểu thức trở thành : $ t^{2} + 4t - 12 = ( t - 2 ) ( t + 6 ) (**)$
Thay ngược lại (*) vào (**) , ta được :
$ (x^{2} + x - 2) ( x^{2} + x + 6)$
KL:
$ (x^{2} + x )^{2} + 4x^{2} + 4x - 12$
= $ (x^{2} + x - 2) ( x^{2} + x + 6 )$
thanks cj nhiều –  Linh Lê Thùy 28-10-17 06:41 AM

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