Engineering Board Exam Reviewer · Inequalities and Absolute Value · medium

Solve x2-5x-6>0.

1. x<-1 or x>6
2. -1<x<6
3. x<1 or x>6
4. x<-6 or x>1

Answer

A. x<-1 or x>6

Solution

(x-6)(x+1)>0. The parabola opens upward, so the product is positive outside the roots: x<-1 or x>6.

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