Question

Ex: 6,7 rapid. Dau coroana

Answer 1

=x^2-2x+3x-x^2=x

=3-6a+6a+2=5

=3a^2-6a-6+6a-3a^2=-6

=x^2+x-12+12-x=x^2

=x^2-7x+5-(x^2-9x+8)=x^2-7x+5-x^2+9x-8=2x-3

=x^2-x-20-3x^2+6x+5x^2-35x-x+7=3x^2-31x-13

=-2x^2+3x^2=x^2

=4x^2 *(3x^3-4x+1):(-4x^2)+3x^3=-3x^3+4x-1+3x^3=4x-1

=(x+5)^2-[(x+5)^2]^2=[(x+5)^2][1+(x+5)^2]=[(x+5)^2](1+25+10x+x^2)=
=(x^2+10x+25)(x^2+10x+26)=x^4+10x^3+26x^2+10x^3+100x^2+260x+
+25x^2+250x+650=x^4+20x^3+151x^2+510x+650