1.

Write the following in roster formThe sets of all positive roots of the equation (x-1)(x+1)(x^2-1)=0

Answer»

ANSWER:

{1,1}

Step-by-step EXPLANATION:

(x-1)(x+1)(x^2-1)=0

=>(x-1)(x+1)(x+1)(x-1)=0     since, (x^2-1)=(x+1)(x-1)

(x-1)=0 ,x=1

(x+1)=0 ,x=-1

(x-1)=0 ,x=1

(x+1)=0, x=1

since the set contains only positive roots .therefore the set MUST be

{1,1).


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