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11)

[tex] {x}^{2} + (k - 1)x - k = 0[/tex]

[tex](x - 1)(x + k) = 0 \\ x = 1 \\ x = - k[/tex]

they are equal so both are one

then k = -1

be careful the answer of q 10 is in the pictures

Ver imagen aaa5350
Ver imagen aaa5350