Q9 of 168 Page 7

Find the zeroes of the quadratic polynomial:

2x2 + x — 1

Equating the expression with 0,


2x2 +x -1 = 0


On factorising it further,


2x2 -x + 2x - 1 = 0


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


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


x = or x = -1


∴ The zeroes of 2x2 + x — 1 are and -1.


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