Question

Facotrs of x2 +ax +b are (x-7) and (x+9) then the value of a and b is

Answer 1

Answer:

a=2 and b -63

Step-by-step explanation:

as (x-7) and (x+9) are the factors so the Roots of equation are 7 and -9

(x-7) (x+9)= 0

the equation is zero either 1st factor or 2nd factor is zero

by equating with zero we got x=7 ,-9

so we know the formula of addition of Roots is equals to -b/a so

- b/a = -2

b/a = 2 Here a= 1 ( coffecient of x^2)

so b=2 ( b is coffecient of x so a= 2)

and the product of Roots equation is c/a

c/a = -63

c= b and a= 1

so b = -63

that's the answer.....