Question

6.If the zeroes of the quadratic
polynomial x2 + (a + 1)X + b are 2 and
-3, then
O a=-7, b=-1
a=5, b in=-1
O a=2, b=-6
O a=0,b=-6​

Answer 1

Answer:

a=0 b=-6

Step-by-step explanation:

let f(x)=x2+(a+1)x+b

2 and -3 are zeros

therefore

f(2) and f(-3)=0

f(2)=4+(a+1)2+b=0.

=4+2a+2+b=0

6+2a+b=0

2a+b=-6............1

f(-3)=9+(a+1)-3+b=0

9-3a-3+b=0

6-3a+b=0

3a-b=6..............2

COMPARING 1 AND 2

2a+b=-6

3a-b=6

________

5a=0

a=0

b=-6

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