Question

resolva as seguintes equações do 2° grau
a)3x²=0
b)2x²-162=0
c)x²=0
d)5x²-125=0
e)5x²-125=0
f)4x²-144=0
g)3x(x-81)=0

Answer 1

a) 3x² = 0
S= ∅

b)2x²-162 = 0
2x² = 162
x² = 162/2
x² = 81
x = √81
x= ±9
S={9;-9}

c)x²=0
S=∅

d)5x²-125 = 0
5x² = 125
x² = 125/5
x² = 25
x = √25
x = ±5
S={5;-5}

e)5x²-125 = 0
5x² = 125
x² = 125/5
x² = 25
x = √25
x = ±5
S={5;-5}

f)4x²-144 = 0
4x² = 144
x² = 144/4
x² = 36
x = √36
x = ±6
S={6;-6}

g)3x(x-81) = 0
3x² -81x = 0
x (3x -81) = 0
x = 0
3x -81 = 0
3x = 81
x = 81/3
x = 27
S={0;27}