Question

7.If 2 Is A Root Of The Equation x squared plus b x plus 12 equals 0 , Find The Value Of B
8.Find The Roots Of The Quadratic Equation 2 x squared plus x minus 6 equals 0

Answer 1

Answer:

7 -> b=-8

8 -> x=-2, 3/2

Step-by-step explanation:

7.

(2)^2+b(2)+12=0

b=-8

8.

2x^2+x-6 = 0

2x^2+4x-3x-6=0

(x+2)(2x-3)

x=-2, 3/2

Answer 2

Answer:

-8the given quadratic equation is x^2+bx+12

let us consider a quadratic equation like,

ax^2+bx+c

then sum of roots is equal to the negative value of b divided by a and the product of roots is c divided by a

here

one root is 2 and let the other be z

then

2×z=12

from this z=6

then

2+6=-b

from this

b=-8