2 sqrt 2 x 2 sqrt2 = 4 x 2 = 8
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Squared. E.g the square root of 4 is 2, and 2 squared is 4.
1/2 times (1 - square root of 5), or 1/2 times (1 + square root of 5)
The square of any square root is equal to the number itself. For example, the square of the square root of 2 squared is equal to 2. The square root of 10 squared is equal to 10.Similarly, the square of the square root of 2 is equal to 2.
4 the way you work this is: 2*(sqrt)2^2 the square root cancels out the exponent, so your left with 2*2
-b + or - the square root on b squared - 4 times a times c over 2