if one of the zeros of the quadratic polynomial as an equal to cos 3 x square - 42 x square x minus 9 is negative of the Other find the value of k
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Answer:
The question says one root is negative of others.
So, the sum of the roots must be zero.
For any quadratic equation
Like : ax
2
+bx+c=0
The sum of roots is given by
a
−b
So, in this equation : 4x
2
−8ka−9
b=−8k & a=4
So, 0=
a
−b
4
−(−8k)
=0
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