Question

How do you write 343 with an exponent by using 7 as a base

Answer 1

if 7 is the base then the exponent is 3.
7x7x7=343
so it's 7 to the power of 3

Answer 2

In exponential form, we can write 343 as 7³. 7×7×7 = 343

In short, Your Answer would be 7³

Hope this helps!