Square of Sum of Radicals

Find the square of $9 + 40 - 1 + 9 - 40 - 1$ .

~6 minAnswer checked instantlyComplex numbersRadicals

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. VIII. Surds and Imaginary Quantities, Examples VIII.b, No. 12

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