Question 75748
THE FIRST STEP FOR THEE TYPE OF EQUATIONS WHERE BOTH TERMS ARE SQUARES IS TO FACTOR EACH SQUARE & THEN MAKE EACH FACTORED TERM A (-) & A (+) OF THE SQUAREROOTS. THUS:
 
(M^4-9N^4) THE SQUARE ROOT OF M^4 IS M^2 & THE SQUARE ROOT OF 9N^4 IS 3N^2 
SO WE HAVE (M^2-3N^2)(M^2+3N^2)