15 3 16 2 21 1

15 = 9 a + 3 b + 1 c16 = 4 a + 2 b + 1 c21 = 1 a + 1 b + 1 c

-1 = 5 a + 1 b + 0 c-5 = 3 a + 1 b + 0 c

4 = 2 a + 0 b

a = 2b = -11c = 30

25 1 28 2 30 3

25 = 1 a + 1 b + 1 c28 = 4 a + 2 b + 1 c30 = 9 a + 3 b + 1 c

-3 = -3 a + -1 b + 0 c-2 = -5 a + -1 b + 0 c

-1 = 2 a + 0 b

a = -0.5b = -4.5c = 48

2 p2 + -11.0 p + 30 = -0.5 p2 + -4.5

2.5 p2 + -6.5 p + -18 = 0

p1 = 4.2816p2 = -1.6816

2 p2 + -11 p + 30 = -0.5 p2 + -4.52 18.3321 + -11 4.2816 + 30 = -0.5 18.3321 + -4.5

19.57 19.57

p + 48

p + 484.2816 + 48