Question

Out of the following equations, find the equation having the sum of the roots as -5
1. 3Xsquare - 15X+ 3 =0
2.Xsquare-5X +3 =0
3.Xsquare +3X-5 =0
4.3Xsquare +15X +3 =0

Answer 1

Answer:

option 4 , 3x^+15x+3=0

Step-by-step explanation:

let alpha and beta be the roots of the given equation.

Since, we know that sum of the roots = -(coefficient of x)/(coefficient of x^2)

then, -(15)/3 = -5

Answer 2

option 1

given that,

1. 3x square -15x+3=0
2. let the two roots be alpha and beta
3. alpha +beta= -b/a
4. a=3
5. b=-15
6. c=3
7. -b/a=-(-15)/3
8. =15/3=5
9. therefore -5 is not egual to 5

option 4

given that ,3xsquare +15x+3=0

let two roots be alpha and beta

alpha+beta=-b/a

a=3

b=15

c=3

-b/a= -(15)/3=-15/3=-5

therefore the sum of the roots is -5. just try the other two options

hope this answer be helpful to you