Let and let
be the inverse of
. Find
Let's find the inverse.....let p(x) = y
y = 2x3 - 113 add 113 to both sides
y + 113 = 2x3 divide both sides by 2
( y + 113 ) / 2 = x3 take the cube root of both sides
3√[( y + 113) / 2] = x exchange x and y
3√[( x + 113) / 2] = y for "y" write q(x)
q(x) = 3√[( x + 113) / 2] so q(137) = 3√[( 137 + 113) / 2] = 3√125 = 5
Let and let
be the inverse of
. Find
Let's find the inverse.....let p(x) = y
y = 2x3 - 113 add 113 to both sides
y + 113 = 2x3 divide both sides by 2
( y + 113 ) / 2 = x3 take the cube root of both sides
3√[( y + 113) / 2] = x exchange x and y
3√[( x + 113) / 2] = y for "y" write q(x)
q(x) = 3√[( x + 113) / 2] so q(137) = 3√[( 137 + 113) / 2] = 3√125 = 5