Square Root with Parameter

Find the square root of $a^{2} - 1 + 2 a - 1$ .

~6 minAnswer checked instantlysquare root of complex numberalgebraic parameters

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. VIII. Surds and Imaginary Quantities, Examples VIII.b, No. 17

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).