## Algebra 1: Common Core (15th Edition)

You have the expression ($b^{-4}$$)^{x}=b^{20}.You have to find the value of x: b^{-4x}=b^{20} -multiply the exponents because you are raising a power to a power. -4x=20 -divide both sides by -4- x=-5 The expression would be (b^{-4}$$)^{-5}$=$b^{20}$