F (x)=×квадрат +5x-1 f (x)=-1

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f(x) = x^2 + 5x - 1

f(x) = -1

By setting the two equations equal to each other:

x^2 + 5x - 1 = -1

x^2 + 5x = 0

Factor out x:

x(x + 5) = 0

Setting each factor to zero:

x = 0, x = -5

Therefore, the solutions for f(x) = -1 are x = 0 and x = -5.