Expand: (x+7)2(x + 7)^2(x+7)2.
x2+49x^2 + 49x2+49
x2+14x+49x^2 + 14x + 49x2+14x+49
x2+7x+49x^2 + 7x + 49x2+7x+49
x2−14x+49x^2 - 14x + 49x2−14x+49