Question

Bantuin dong yang no.5 ?

Answer 1

H(t) = 3t² - 2t

a) Banyak bakteri setelah 5 detik:
h(5) = 3(5)² - 2(5)
      = 75 - 10
      = 65

b) 3t² - 2t = 645
3t² - 2t - 645 = 0
t₁₂ = (2 +- √(4 - 4(3)(-645))/6
    = (2 +- √7744)/6
    = (2 +- 88)/6
t₁ = (2 + 88)/6 = 90/6 = 15 detik

Answer 2

A. t= 5
b(5) = 3. 5^2 - 2.5
b(5) = 75 - 10
b(5) = 65 bakteri