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Question

Find the range of rational expression y=x2+34x71x2+2x7 if x is real


A

[5,9]

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B

[5,9]

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C

(,5][9,)

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D

(,5][9,)

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Solution

The correct option is C

(,5][9,)


y=x2+34x71x2+2x7 x2(y1)+x(2y34)+(717y)=0

Given that x is real

b24ac0(2y34)24(y1)(717y)04[y2+28934y+7y278y+71] 0y214y+450y(y9)5(y9)0(y5)(y9)0

for y5 & y 9y 5 and y 9Hence y ϵ(,5][9,)


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