As my high school algebra teacher used to say, show your math, because if I don't know what steps you took, I don't know what steps you didn't take, and if I don't know what questions you asked, I don't know what questions you didn't ask.
Cómo decía mi maestro de álgebra: "muestra tus matemáticas, porque si no sé qué pasos usaste, no sé qué pasos no tomaste, y si no sé qué preguntas hiciste, no sé qué preguntas no hiciste".