Evaluate this expression

Evaluate this expression for r = -3 and s = 5.

r-4s2 (the -4 and the 2 are exponents)

Please show work. Thanks !

use the caret ^ (above the 6) to denote an exponent...

(r^- 4)(s^2)

for r = - 3, and s = 5

simple substitution and evaluation...

r^- 4 = (- 3)^- 4 = 1/(- 3)^4 = 1/81

s^2 = 5^2 = 25

25/81

why can't you do this ? Go to your teacher for help...read your textbook.

If r=-3
and
s=5

then

r^4s² = (-3)^(-4)(5)² = [(-3)^-4]x25 = (1/81)(25) =

25
——
81