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Question

If x = b+b24ac2a, then express the given formula in terms of a.


A

x(-c/x – 4b)

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B

(c/x – 4b)/x

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C

(-c/x – 4bx)/x

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D

- ( c + xb )​/x2

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Solution

The correct option is D

- ( c + xb )​/x2


x = b+b24ac2a

(2ax+b)=b24ac

(2ax+b)2=(b24ac) (Squaring both sides)

4a2x2+b2+4axb=b24ac

4a2x2+4axb=4ac

ax2+xb=c

a = cbxx2


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