Verify Radical Equations

Precalculus
David Cohen
Edition 3
Chapter 1, Section 1.1

For each equation, use a calculator to verify that the quantities on both sides agree, to six decimal places.

60A. sqrt{7} - sqrt{8 - 2•sqrt{7}} = 1

60B. Let cr = cube root. cr{2 + sqrt{5}} + cr{2 - sqrt{5}} = 1

60C. Let fr = fifth root fr{176 + 80•sqrt{5}} = 1 + sqrt{5}

The following request is not in the textbook. Verify that both sides are equal WITHOUT a calculator.