Question

e(x)=(2x-1)^(2)-(x+2)(x-3)-3(x+2)^(2) , x nr real . E(x)<10.

Answer 1

E(x)=4x^2-4x+1-(x^2-3x+2x-6)-3(x^2+4x+4)
E(x)=4x^2-4x+1-x^2+3x-2x+6-3x^2-12x-12
E(x)=(4x^2-x^2-3x^2)+(-4x+3x-2x+12x)+(1+6-12)
E(x)=9x-5
pt ca E(x)<10,x=0 și x=1