x3 + 3x - 4 = x3 - x + 4x - 4
= x(x2 - 1) + 4(x - 1)
= x(x + 1)(x - 1) + 4(x - 1)
= (x - 1) [ x(x + 1) + 4 ]
=(x - 1)(x2 + x + 4)
\(x^3+3x-4\)
\(=\left(x^3-x^2\right)+\left(x^2-x\right)+\left(4x-4\right)\)
\(=\left(x-1\right)\left(x^2+x+4\right)\)
x^3+3x-4 = (x^3-1)+(3x-3)
= (x-1).(x^2+x+1)+3.(x-1) = (x-1).(x^2+x+1+3) = (x-1).(x^2+x+4)
k mk nha
x3+3x-4
=x+x2+2x+1-4
=x+(x2+2x+1)-4
=x+(x+1)2-22
=x+(x+1+2)(x+1-2)