Simplify: x^3+x^3

My answer was : 2x^6 is this incorrect because my test the teacher had marked it wrong as if he was saying that it. Was going to be. 2x^3 instead

2 answers

no
1 x^3 + 1 x^3 = 2 x^3

1 apple + 1 apple = 2 apples
Ok thankyou