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CBSE Class 10 Answered

 Solve the quadratic equation by the formula method. x2 + x - 2 = 0
Asked by arajeevshashank | 25 Jun, 2020, 07:19: PM
answered-by-expert Expert Answer
x2 + x - 2 = 0
 
a = 1, b = 1 and c = -2
begin mathsize 16px style straight x space equals space fraction numerator negative straight b plus-or-minus square root of straight b squared minus 4 ac end root over denominator 2 straight a end fraction equals fraction numerator negative 1 plus-or-minus square root of 1 plus 8 end root over denominator 2 end fraction equals fraction numerator negative 1 plus-or-minus square root of 9 over denominator 2 end fraction equals fraction numerator negative 1 plus-or-minus 3 over denominator 2 end fraction rightwards double arrow straight x space equals space fraction numerator negative 1 plus 3 over denominator 2 end fraction space or space space straight x space equals space fraction numerator negative 1 minus 3 over denominator 2 end fraction rightwards double arrow straight x space equals 1 space or space straight x space equals space minus 2 end style
Answered by Yasmeen Khan | 25 Jun, 2020, 08:34: PM

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