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Question

The number of real solutions of the equation 2x2+(2+1)x=(5+22)x2 is:

A
one
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B
four
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C
six
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D
infinite
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Solution

The correct option is A one
2x2+(2+1)x=(5+22)x2 (25+22)x+(2+15+22)x=1
which is of the form
cosxα+sinxα=1
x = 2.

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