Question

x (x - 7) (x + 7) – (x +2) ( x^2 – 2x + 4) + 3 (x – 4)^2

Answer 1

$x (x - 7) (x + 7) - (x +2) ( x^2 - 2x + 4) + 3 (x - 4)^2 \\x(x^2-49)-(x^3+8)+3(x^2-8x+16)\\x^3-49x-x^3-8+3x^2-24x+48 \\-73x+40+3x^2$