Is 12cm, 24cm, 29cm a right triangle

YES OR NO

The polynomial function of least degree with a leading coefficient of 1 is: f(x) = x3 + ax2 + bx + c

In triangle abc segment de is parallel to the side ac . (the endpoints of segment de lie on the sides ab and bc respectively). find de, if ac=20cm, ab=17cm, and bd=11.9cm;

Kylie explained that (-4x+9)^2 will result in a difference of squares because (-4x+9)^2 (-4x+9)^2 =(-4x)^2+(9)^2=16x^2+81