Question

a resposta dessas equaçoes de 2 grau porfavor 
5x^2+6x+3$5 x^{2} +6x+9=0$
$2 x^{2} +3x+1=0$

Answer 1

5x²+6x+9=0 =>
delta=b²-4ac
delta=(6)²-4.5.9
delta=36-180 
delta=-144 (sem solução em R)
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2x²+3x+1=0
delta=b²-4ac
delta=3²-4.2.1 =>
delta=9-8 =>
delta=1
====================
x=-b ±√Δ/2a
x=-3±√1/2.2 =>
x'=-3±1/4 =>
x'=-3+1/4 =>
x'=-2/4 => x'=-1/2
x''=-3-1/4 => x''=-4/4 => x''=-1