Question

[tex]Calculati \\ 3(x-2)^2+(x-5)*(x+5)-2x(x-6).
[/tex]

Answer 1

   
[tex]\displaystyle\\ 3(x-2)^2+(x-5)(x+5)-2x(x-6)=\\ =3(x^2-4x+4)+ (x^2-5^2)-2x(x-6)=\\ =3x^2-12x+12+ x^2-25-2x^2+12x=\\ =3x^2 + x^2-2x^2 -12x +12x +12-25= \boxed{\bf 2x^2-13} [/tex]