0

Guest

Courses New

2053_88904_IMG_20140328_121046.jpg

Grade:12

3 Answers

bharat bajaj IIT Delhi
askIITians Faculty 122 Points
8 years ago
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
Sher Mohammad IIT Delhi
askIITians Faculty 174 Points
8 years ago
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


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

Think You Can Provide A Better Answer ?

Other Related Questions on Algebra

View all Questions »

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More