00:00 Simply
00:03 Let's use shortened multiplication formulas to open the parentheses
00:21 Square both numerator and denominator
00:26 Make sure to multiply numerator by numerator and denominator by denominator
00:31 Square both numerator and denominator
00:35 Reduce what's possible
00:41 Let's substitute in our exercise
00:58 Let's use shortened multiplication formulas to open the parentheses
01:16 Square both numerator and denominator
01:21 Make sure to multiply numerator by numerator and denominator by denominator
01:25 Reduce what's possible
01:37 Let's substitute in our exercise
01:50 Negative times positive is always negative
01:54 Negative times negative is always positive
02:02 Collect like terms
02:29 Let's use shortened multiplication formulas and write in a different form
02:32 And this is the solution to the question