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CBSE Class 10 Answered

Draw a graph of a polynomial -3x2 + 2x – 1 and observe the shapeof the curve when coefficient of x2 is negative.
Asked by rajeevkumargupta8 | 16 May, 2021, 05:32: PM
Expert Answer
The given polynomial is -3x2 + 2x - 1
Zeroes of this polynomial will be
straight x equals fraction numerator negative 2 plus-or-minus square root of 4 minus 4 open parentheses 3 close parentheses end root over denominator 2 open parentheses negative 3 close parentheses end fraction equals fraction numerator negative 2 plus-or-minus 2 square root of negative 2 end root over denominator negative 6 end fraction equals fraction numerator 1 plus-or-minus straight i square root of 2 over denominator 3 end fraction
As the coefficient of x2 is negative, shape of the curve will be downwards opening parabolic curve
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