The idea here is that in the expression for the function - which seems to be "x-5" - you replace every occurrence of "x" by -1. Then you do the indicated calculations.
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It is a quadratic expression and can be factored into: (3x+1)(x+2)
(x + 2)(x + 1)
(x + 2)(x + 1)
3x^2 -14x +15 = (3x-5)(x-3)
The factors are [3x + 5 - 2*sqrt(10)] and [3x 5 + 2*sqrt(10)].