Please answer the 8th,9th and 10th question.its urgent please..
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Step-wise solution for no. 8
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avikal51:
alpha + beta is -1/2 and not -2
and can you explain how?
Sorry but you did it wrong
when 2 is taken common outside it is supoose to be divide in the other side
Can you tell me one thing, how did you get -b/a as -1
i got -1/2
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let 2alpha =A and 2beta =B
A+B= -b/a
2alpha+2beta=-1
2(alpha+beta)=-1
alpha+beta= -1/2 ..........(i)
A*B=c/a
2alpha*2beta=1/4
alpha*beta=1/16............(ii)
putting (i) in(ii)
-1/2 beta*beta=1/16
beta^2 =1/16+1/2
beta^2=9/16
beta=+- 3/4 .......(iii)
putting (iii) in (i)
you get the value of alpha.
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