3e) (p+5)2-(p-3)2 = 12(p+4)
p2+10p+10-p2-6p+6 = 12p+48
4p+16 = 12p+48
16 = 8p+48
-32 = 8p
-4 = p
3f) (2p+3)2-(p-4)2+18 = 3(p2+2)-5
4p2+10p+6-p2-8p+8+18 = 3p2+6-5
3p2+2p+32 = 3p2+1
2p+32 = 1 / 2p = -31 / p = 15 1/2 ???????
(p + 5)^2 - (p - 3)^2 = 12·(p + 4)
p^2 + 10·p + 25 - (p^2 - 6·p + 9) = 12·p + 48
p^2 + 10·p + 25 - p^2 + 6·p - 9 = 12·p + 48
16·p + 16 = 12·p + 48
4·p = 32
p = 8
(2·p + 3)^2 - (p - 4)^2 + 18 = 3·(p^2 + 2) - 5
4·p^2 + 12·p + 9 - (p^2 - 8·p + 16) + 18 = 3·p^2 + 6 - 5
3·p^2 + 20·p + 11 = 3·p^2 + 1
20·p = -10
p = -1/2
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