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Question
Determine the nature of the roots of the following quadratic equation :
2x2 + x-1=0
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Solution
2x2 + x-1=0
b2 - 4ac
= (1)2-4(2)(-1)
= 1+ 8
=9
Since 9 is a perfect square and greater than 0, hence the roots are real and rational.
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