If are zeroes of quadratic polynomial 42 − − 4 then the quadratic
polynomial whose zeroes are 2 2 is :
(a) 22 − − 8 (b) 42 − − 8 (c) 22 + − 8 (d) 22 − − 8
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Answer:
Answer
Correct option is
B
2x
2
−8x+7
According to question,
Sum of zeroes =
2
4+
2
+
2
4−
2
=4
And , product of zeroes is =
2
4+
2
×
2
4−
2
=
2
7
As, we know that,
Eq. =x
2
−(sum of roots)x+ (product of roots)
⟹x
2
−4x+
2
7
=0
⟹2x
2
−8x+7
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