Question

8) If a and b are the zeroes of polynomial x2+5x+6 then the value of a+ b + ab
a) -11
(b) 11
(c) 1
(d) -1​

Answer 1

Answer:

Given polynomial is x² + 5x + 6

Explanation:

We know that general form of a quadratic polynomial is,

ax² + bx + c where a ≠ 0

compare with x² + 5x + 6

a = 1, b = 5, c = 6

Also, given that a and b are zeroes then

sum of zeroes = -b/a = - 5/1 = -5 = (a + b)

product of zeroes = c/a = 6/1 = 6 = (ab)

Now,

a + b + ab = -5 + 6 = 1

The answer is Option (c) 1 .