Question

Find the value of x if: 7x+9-2x=4(x-1)+9 -7

Answer 1

ANSWER

Let the common root of the equations be p.

Then, p

2

+4ap+3=0 ⇒ 2p

2

+8ap+6=0

and 2p

2

+3ap−9=0

Equating both the equations

2p

2

+8ap+6 = 2p

2

+3ap−9

⇒ 5ap=−15

⇒ ap=−3

Substitute the value of ap in the first equation

Then, p

2

+4(−3)+3=0

⇒ p

2

=9

⇒ p=±3

⇒ a=±1

∴ Option B is correct.

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Answer 2

Answer:

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