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\[f()=(x+2)(x+1)(x-5)\]

sorry it should be f(x)

okay i understand that but im unsure of what to put for the answers, because in the back of the book (answers) their like this, (b) -25 (c) x<-2 or -1

That's what I get for not fully reading the question. They just want to know when that f(x) is positive, a zero, or negative. You use the sign chart to determine when it is negative and positive. So for (a) you wish to find the zeros which are at (-2), (-1), and (5).
(b) however asks for when the equation is positive. It just wants the ranges. So the sign chart says that the equation is positive from (-2) to (-1) or x is greater than (-2) but less than (-1). Therefore, -2

omg thankyou so much i wouldve failed my test tomorrow lol my teacher was no help <333