Question

Considere a = √9m, b = 2 √100m e c = -8 √36m e calcule: a+b+c

Answer 1

a=3m, b=2.10 ou 20m, c=-8.6 ou -48m
 a+b+c=3+20+(-48)
23-48
25m

Answer 2

Δ=b²-4.a.c
Δ=2²-4.9.-8
Δ=4-28
Δ=-24

x1 = -4+24 : 2.a = 20 / 4 x1=5

x2 = -4-24 : 2.a = -28 / 4 = -7

S [5,-7]