What are the zeros to -2x(3x+1)^ 2 (x+7)^7

Plzzz plzz maths ! quadratic sequences =an^2+bn 1) 1,6,15,28,45 2)5,18,39,68,105 3) 1,8,21,40,65 4) 7,24,51,88,135 5) -1,2,9,20,35

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Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?