Question

Calculati :3(x-2)la  puterea a 2a + (x-5) (x+5)-2x(x-6)

Answer 1

$3(x-2)^2+(x-5)(x+5)-2x(x-6)=$
$=3(x^2-4x+4)+x^2-25-2x^2+12x=$
$=3x^2-12x+12+x^2-25-2x^2+12x=$
$=2x^2-13$