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CBSE Class 10 Answered

<h2>show that the polynomial x2-2x+5 has no real zero.</h2>
Asked by chandra.abhijit | 24 Jun, 2015, 10:53: PM
Expert Answer
C o n s i d e r space t h e space g i v e n space p o l y n o m i a l space x squared minus 2 x plus 5. H e r e comma space a equals 1 comma space b equals negative 2 space a n d space c equals 5 therefore D i s c r i m i n a n t space D equals open parentheses negative 2 close parentheses squared minus 4 cross times 1 cross times 5 equals 4 minus 20 equals negative 15 S i n c e space t h e space v a l u e space o f space d i s c r i m i n a n t comma space minus 15 less than 0 comma space t h e space g i v e n space p o l y n o m i a l space h a s space n o space r e a l space z e r o s.
Answered by Vimala Ramamurthy | 25 Jun, 2015, 08:41: AM
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