You can put this solution on YOUR website! You want to solve the equation for A but there is no CAPITAL letter A in the equation. I assume that you want to solve for little a.
c = sqrt{a^2 + b^2}
Square both sides as step one.
By squaring both sides, you will remove the radical from the right side of the equation.
c^2 = [sqrt{a^2 + b^2}]^2
c^2 = a^2 + b^2
Subtract b^2 from both sides as step two.
c^2 - b^2 = a^2 + b^2 - b^2
c^2 - b^2 = a^2
NOTE: + b^2 and - b^2 cancel each other out.
Now take the square root of both sides.
sqrt{c^2 - b^2} = sqrt{a^2}
sqrt{c^2 - b^2} = a
Done!
