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  • Which values of x satisfy the inequality (x + 1)(x - 3) < 0? Option: 1

Which values of x satisfy the inequality (x + 1)(x - 3) < 0? 

Option: 1

x\in(-1,\infty)


Option: 2

x\in(-1,3)


Option: 3

x\in(-3,1)


Option: 4

x\in(-\infty,3)


Answers (1)

best_answer

As we have learnt in

 Frequently Used Inequalities

\\\mathrm{1.\;\;(x-a)(x-b)<0\Rightarrow x\in(a,b),\;where\;\;a<b}\\\mathrm{2.\;\;(x-a)(x-b)>0\Rightarrow x\in(-\infty,a)\cup(b,\infty),\;where\;\;a<b}\\\mathrm{3.\;\;x^2\leq a^2\Rightarrow x\in[-a,a]}\\\mathrm{4.\;\;x^2\geq a^2\Rightarrow x\in(-\infty,-a]\cup[a,\infty)}

 

Now,

Given (x + 1)(x - 3) < 0

on number line mark x = -1, 3

from the concept  -1 < x < 3 

correct option is x\in(-1,3)

Posted by

rishi.raj

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