Question

Resolva as equações do 2 grau
a)x²+13=0. B)7x²-14=0 C)x²-225=0​

Answer 1

Resposta:

Oi amigo ;_)

${x}^{2} + 13 = 0 \: \: \: \: \: \: \: {x}^{2} = - 13 \: \: \: \: \: \: x = \sqrt{ - 13} \: \: \: \: \: \:$

X ∉ ℝ

$7 {x}^{2} - 14 = 0 \: \: \: \: \: 7 {x}^{2} = 14 \: \: \: \: \: \: x {}^{2} = 2 \: \: \: \: \: x = \sqrt{2} \: \: \: \: \: \: x = - \sqrt{2}$

${x}^{2} - 225 = 0 \: \: \: \: {x}^{2} = 225 \: \: \: \: \: \: \: x = \sqrt{225} \: \: \: \: \: \: \: x = 15 \: \: \: \: \: \: \: x = - 15$