Hi there, could someone please help me with the following:

The answer is 10%, but I want to know how you get that 10%.

Once again, I am unsure of as to what you do with the power when you move the equation across. Please could someone help!

Thank you.

Equation: Solve for r_{2}

$826.45 = $1000 / (1 + r_{2})^{2}

r_{2 }= 10%