Wiedząc że A=4x-1;B=5-x;C=-x-3, wykonaj działania;
a)A*B-3C
(4x-1)(5-x)-3(-x-3)=
=20x-4x^2-5+x+3x+9=-4x^2+24x+4
b)-3A-B*C
-3(4x-1)-(5-x)(-x-3)=
=-12x+3-(-5x-15+x^2+3x)=
=-12x+3+5x+15-x^2-3x=-x^2-10x+18
c)
-A*C+2B^2=-(4x-1)*(-x-3)+2(5-x)^2=
=-(-4x^2-12x+x+3)+2(25-10x+x^2)=
=4x^2+12x-x-3+50-20x+2x^2=
=6x^2-9x+47