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x=0
x+7=0
x=0
x=-7
x1=-7 x2=0
b) x2=4
x= +- 2
x=2
x= -2
x1= -2 x2=2
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a=1
b=7
c=0
Aplicas formula: x₁,₂= -b⁺/⁻√b²-4ac
-----------------
2a
x₁,₂=-7⁺/⁻√7²-4(1)(0)
----------------------
2(1)
x₁,₂= -7 ⁺/⁻ √49
--------------
2
Ahora hallamos x₁
x₁= -7+7 → x₁= 0
-------
2
Y por ultimo x₂
x₂= -7-7 x₂= -7
------ ⇒
2
Rpta: Cs[0,-7]
2) x²-4=0
x²-0x-4=0
↓ ↓
x +2 = -2
x -2= 2
-------
0
∴(x+2)(x-2)=0
x=2 ∧ x=-2
Rpta: Cs[2,-2]