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(2 + 4i) - (7 + 4i) = -5 2 + 4i - 7 + 4i = -5 + 8i
The two square roots of i are (k, k) and (-k, -k) where k = sqrt(2)/2 = 1/sqrt(2).
The square roots of 4 are -2 and 2.
square inches do not have square roots only number have square roots.
All prime numbers have irrational number square roots, so if you try to find the square root of a non-perfect square number use them to simplify it. For example, ±√125 = ±√25*5 = ±5√5 (when you want to show both the square roots) √72 = √36*2 = 6√2 √-27 = √-9*3 = 3i√3