Respuesta :
x^2 + 14x + ___
take half of ur x term...which would be half of 14, which is 7...and square it....7^2 = 49
x^2 + 14x + 49
take half of ur x term...which would be half of 14, which is 7...and square it....7^2 = 49
x^2 + 14x + 49