Q. 24.5( 8 Votes )

Which of the following are the roots of 3x2 + 2x - 1 = 0 ?

(i) - 1 (ii) 1/3 (iii) –1/2

Answer :

(i) - 1 is the root of given equation.

Explanation - Substituting value - 1 in LHS


=


= 3 - 2 - 1


= 3 - 3 = 0 = RHS


Value satisfies the equation or LHS = RHS.


(ii) is the root of the given euation


Explanation - Substituting value in LHS


=


=


= 1 - 1 = 0 = RHS


Value satisfies the equation or LHS = RHS.


(iii) is not the root of given equation


Explanation - Substituting value in LHS


=


=


= ≠ 0 ≠ RHS


Value does not satisfy the equation or LHS ≠ RHS.


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