Question

3)Resolva as equações incompletas do 2o grau a) 3x2 – 7 = 5 b) X 2 + 1 = 10 c) 2x2 – 32 = 0 d) x 2 + 2 = 27

Answer 1

Resposta:

a)

${3x}^{2} - 7 = 5 \\ {3x}^{2} = 12 \\ {x }^{2} = 4 \\ x = ± \sqrt{4} \\ |x' = 2| \\ |x'' = - 2|$