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f(c) ⇒ 13c - 45 = - 2c
13c + 2c = 45
15c = 45
c = 45/15
c = 3
soal nomer 15
g(-3) ⇒3px² - 8 = 28
3(-3)p² = 28 + 8
-9p² = 36
p² = 36/-9
p² = -4
p = √ 4
p = -2