Question

If a and b are the zeros of quadratic polynomial 3x2 -7x-8, find the  value of a+b-ab​

Answer 1

Answer:

Correct option is

A

2

7

Given: α,β are zeroes of the polynomial 5x

2

−7x+2

To find the value of

α

1

+

β

1

Sol: From the given quadratic equation,

α+β=

5

7

and αβ=

5

2

Therefore,

α

1

+

β

1

=

αβ

α+β

=

5

2

5

7

⟹

α

1

+

β

1

=

2

7