Find the square of:

607

Find the square of:

391

If $a +\dfrac{1}{a}= 2$, find :

(i) $a^2 +\dfrac{1}{a^2}$

(ii) $a^4 +\dfrac{1}{a^4}$

If $m -\dfrac{1}{m}= 5$, find:

(i) $m^2 +\dfrac{1}{m^2}$

(ii) $m^4 +\dfrac{1}{m^4}$

(iii) $m^2 -\dfrac{1}{m^2}$