Factor t^2-49.
We have t^2 -49 = t^2 - 7^2 = (t-7)(t+7).
Complete the following task based on the instruction and optional input provided.### Instruction:
Factor t^2-49.

### Output:
We have t^2 -49 = t^2 - 7^2 = (t-7)(t+7).