Question

Make b the subject of the formula.

Answer 1

x = ^a/_{√(a-b)(a+b)}
x =  ^a/√(a² -b²)
x² = ^_a2/^_(a2 - ^_b2₎
a² = a²x² - b²x²
b²x² = a²x² - a²
b² = (a²x² - a² )/x²
b² = a² -  a² /x²
b = ±√( a² - a²/x²)