There is no exponent rule that says x^a + x^b = x^(a + b). However, in the case of this question, you can say that 2^a + 2^a = 2(2^a), just like you can say x + x = 2x… Log in to Reply

## Comments (2)

why doesnt 2^a+2^a become a+a? why did it become 1+a?????

There is no exponent rule that says x^a + x^b = x^(a + b). However, in the case of this question, you can say that 2^a + 2^a = 2(2^a), just like you can say x + x = 2x…