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Question

If px2+qx+r=0 has equal roots, then q2=

A
4p
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B
4pr
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C
8pr
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D
pr
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Solution

The correct option is D 4pr
px2+qx+r=0

The standard quadratic equation is ax2+bx+c=0

For roots to be equal
b24ac=0or,b2=4acso,(q)2=4×p×rq2=4pr

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