Question

. calcule o valor de delta
d) x²+6x -9=0
e) -x²-2x-1=0
f) -x²-8x-12=0

Answer 1

d) b^2 - 4 . a . c

6^2  - 4 . 1 . (-9)

36 - 36

delta = 0

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e) b^2 - 4 . a . c

(-2)^2 - 4 . (-1) . (-1)

4 - (-4)

delta = 8

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f) b^2 - 4 . a . c

(-8)^2 - 4 . (-1) . (-12)

64 - (-48)

delta = 112