Question

3) Resolva as equações do 2º grau incompletas: a) 4x2 - 36 = 0 b) 7x2 - 21 = 0 c) x2 + 9 = 0 d) x2 - 49 = 0 e)5x²-20=0 f)2x²+8x=0 g)3x²-12x=0 h)x²-7x=0 i)4x²+20x=0 j)-x²-5x=0​

Answer 1

Resposta:

a) S={3,-3}

b)S={$\sqrt{3}$, -$\sqrt{3}$}

c)S={±$\sqrt{-9}$}

d)S={7,-7}

e)S={2,-2}

f)S={0,-4}

g)S={0,4}

h)S={0,7}

i)S={0,-5}

j)S={0,5}