Book: RS Aggarwal - Mathematics
Chapter: 10. Quadratic Equations
Subject: Maths - Class 10th
Q. No. 2 of Exercise 10A
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2
Which of the following are the roots of 3x2 + 2x - 1 = 0 ?
(i) - 1 (ii) 1/3 (iii) –1/2
(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.
