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Question

Q.(ii). Find range of :
6x2-22x+215x2-18x+17 xR

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Solution

Dear student
Let y=6x2-22x+215x2-18x+17y5x2-18x+17=6x2-22x+215x2y-18xy+17y=6x2-22x+216x2-22x+21-5x2y+18xy-17y=06-5yx2+-22+18yx+(21-17y)=0Here a=6-5y,b=-22+18y and c=(21-17y)So, D=b2-4ac=-22+18y2-46-5y21-17y=484+324y2-792y-4126-102y-105y+85y2=484+324y2-792y-504+828y-340y2=-16y2+36y-20So,-16y2+36y-200-4y2+9y-504y2-9y+50Consider,4y2-9y+5=0y=-(-9)±-92-44524 By quadratic formulay=9±81-808y=9±18y=1 or y=54So,y-54y-10Compute the signs of the factors of y-54y-1
y<1 y=1 1<y<54 y=54 y>54
y-54 - - - 0 +
y-1 - 0 + + +
y-54y-1 + 0 - 0 +

Choosing ranges that satisfy the required condition:01y54So, The range is x1,54
Regards

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