Your formatting is very ambiguous and I'm struggling to figure out what exactly the problem is. I'm guessing this is one problem, where the 7i^{2} is the denominator of the fraction.

If I'm not correct, please correct me. The next thing I'm assuming is that *i* in this problem is the imaginary number, rather than a variable. If it's the imaginary number, then i^{2} has a constant value. Do you know what that value is? As a hint, the imaginary number is defined as the square root of -1. By extension, then, what is i^{4}? Once you have the *i* terms taken care of, you can tackle the numerator.

Do you remember your exponent rules? Like, \(\displaystyle \left(a\cdot b\right)^c=?\) and \(\displaystyle \left(x^a\right)^b=?\). Hopefully this is enough of a hint to get you started. If you get stuck again, please include all of your steps and workings when you reply back.