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Question

If the quadratic equations ax2+2cx+b=0 and ax2+2bx+c=0, (bc) have a common root, then the value of a+4b+4c is

A
12
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B
1
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C
3
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D
0
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Solution

The correct option is D 0
Let α be the common root.
aα2+2cα+b=0 and aα2+2bα+c=0
2α(cb)+(bc)=0
α=12 (bc)

So, a(12)2+2c(12)+b=0
a+4b+4c=0

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