Calcule mentalmente as equaçoes
A)8x''-8x+15=0
b)x''-9x+14=0
c)x''+6x+8=0
d)X"+12x+11=0
e)x''-5x+6=0
f)x''+5x-6=0
g)x''-x12
h)x''-14x-32
i)x"-12x+36
j)x"+4x+4

me ajudem !!!!!!
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