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The values ·of a for whic.h y = x^2 +ax+...

The values ·of a for whic.h `y = x^2 +ax+ 25` touches the axis of x are

A

`+- 5`

B

`+- 10`

C

` +- 2`

D

`+- 1`

Text Solution

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The correct Answer is:
B
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