# Choose the correct answer from the given four options in the following questions:If the zeroes of the quadratic polynomial $a x^{2}+b x+c, c 0$ are equal, then(A) $c$ and $a$ have opposite signs(B) $c$ and $b$ have opposite signs(C) $c$ and $a$ have the same sign(D) $c$ and $b$ have the same sign

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Given:

The zeroes of the quadratic polynomial $ax^2+bx+c,\ c\ ≠ 0$ are equal.

To do:

We have to find the sign of the roots of the quadratic polynomial.

Solution:

Given that the zeros of the quadratic polynomial $ax^2+bx+c,\ c\ ≠ 0$ are equal.

$\Rightarrow$ Value of the discriminant $( D)$ has to be zero for equal roots.

$\Rightarrow b^2-4ac=0$

$\Rightarrow b^2=4ac$

Since $b^2$ cannot be negative, thus, R.H.S. can also be never negative.

Therefore, $a$ and $c$ must have the same sign.

Updated on 10-Oct-2022 13:27:08