Exercise 43 Page 422

To evaluate the given expression for r = -3 and s = 5, we should substitute these values into the expression and simplify as much as possible.

r^(-4)s^2

SubstituteII

r= -3, s= 5

( -3)^(-4) 5^2

NegExponentToFrac

a^(- m)=1/a^m

1/(-3)^4 * 5^2

CalcPow

Calculate power

1/81 * 25

MoveRightFacToNumOne

1/b* a = a/b

25/81