Question

4. If the the zeroes of the polynomial f(x) = x² – ax + (b+1) are 4 and -5, then
(a) a = 1, b = -19
(b) a= -1, b = -19
(c) a = 1, b = -21​

Answer 1

Answer:

b is the right answer mark as brainliest brother

Answer 2

Case 1-

(4)²-4a+(b+1) =0

16-4a+b+1=0

4a-17=b ---1

Case 2-

(-5)²-(-5)a+(b+1) =0

25+5a+b+1=0

-26-5a=b

-26-5a=4a-17

-26+17=4a+5a

-9=9a

-1=a

So,

4a-17=b => 4(-1)-17=b =-21

a = - 1 and b = - 21