As 18=2x32, sqrt(18)=sqrt(2x32)=3 sqrt(2)
sqrt(18)-sqrt(2)=3 sqrt(2) - sqrt(2) = 2 sqrt(2)
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The square root of -4 is: 2 i
Oh, what a happy little math problem we have here! When you have 3 times the square root of 2 minus 1 times the square root of 2, you can combine like terms. So, 3 root 2 minus root 2 is equal to 2 times the square root of 2. Just like that, we've created a beautiful, simplified expression.
sqr root of 18 = 3 * square root of 2
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it is 18 because when you put all the numbers back into the square root it becomes the square root of 18 and the square root of 18 squared would be 18