Question

resolva as equações de 2 grau

A) (x-2)²-30=8

B) 5x(x-6)=10x

C) (x+2)²+4x=(x+2)
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Answer 1

Resposta:

A) x^2 - 4x + 4 - 38 = 0

x^2 - 4x - 34 = 0

Delta = 16 + 136 = 152

x' = 14,32   x'' = -10,32

B) 5x^2 - 30x = 10x

5x^2 - 40x = 0

x(5x - 40) = 0

x' = 0   x'' = raíz de 8

C) x^2 + 4x + 4 + 4x = x + 2

x^2 + 7x + 2 = 0

delta = 49 - 8 = 41

x' = -1,40/2

x'' = -13,40/2