Need Help Suku Banyak Nomor 2 Thank's

p(-1) = q(-1)
5(-1)^4+2r^2(-1)^3+(-1)^2 +1 =4(-1)^5+3r(-1)^2 -3(-1)-1

5-2r^2 +1 + 1 = -4+3r +3-1
7-2r^2 = 3r -2
-2r^2 -3r +9 = 0
2r^2 +3r -9 = 0
(2r -3) (r +3) = 0

2r -3 = 0
2r = 3
r = 3/2
atau
r+3 = 0
r = 3

jadi r itu 3/2 atau 3