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Grade: 12

                        

6 years ago

Answers : (3)

bharat bajaj
IIT Delhi
askIITians Faculty
122 Points
							Discriminant = b^2 - 4ac
As a>0 , b<0 and c<0
D > 0 , Hence we have two roots. So it could be A or B.
Now, the product of the roots = c/a
Product is negative. Hence, one root is positive and one is negative. Hence, the answer is (B)
Thanks
Bharat Bajaj
IIT Delhi
askiitians faculty
6 years ago
Sher Mohammad
IIT Delhi
askIITians Faculty
174 Points
							
x^2-2px+8p-15
let roots are a, b
case 1: one root is between (0,1) and another root is greater than 2

ab=8p-15 >=0 imply p>15/8

a+b=2p >2 imply p>1

p belongs (1,inf)

case 2: one root is less than <0 and another root is greater than 2

ab=8p-15<0 imply p<15/8
a+b=2p <2 imply <1
(-inf, 15/8)

hence d is the correct answer


sher mohammad
b.tech, iit delhi


6 years ago
mycroft holmes
272 Points
							Since a>0, the graph is upward facing. Also f(0) <0. Hence (B) is correct
						
6 years ago
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