Решите пжж (это уравнения)



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1) (x + 9)^2 - x(x + 8) = 1

x^2 + 18x + 81 - x^2 - 8x - 1 = 0

10x + 80 = 0

10x = -80

x = -8

2) (x - 11)^2 = (x - 7)(x - 9)

x^2 - 22x + 121 = x^2 - 16x + 63

x^2 - 22x + 121 - x^2 + 16x - 63 = 0

-6x + 58 = 0

6x = 58

x = 29/3