Question and Answers Forum

All Questions      Topic List

Mensuration Questions

Previous in All Question      Next in All Question      

Previous in Mensuration      Next in Mensuration      

Question Number 49356 by peter frank last updated on 06/Dec/18

Commented by peter frank last updated on 07/Dec/18

am getting greatest area is  4πa.

$$\mathrm{am}\:\mathrm{getting}\:\mathrm{greatest}\:\mathrm{area}\:\mathrm{is}\:\:\mathrm{4}\pi\mathrm{a}. \\ $$

Answered by tanmay.chaudhury50@gmail.com last updated on 06/Dec/18

2)solve x+y−1=0  y^2 =6x  (1−x)^2 =6x  1−2x+x^2 −6x=0  x^2 −8x+1=0  x_1 +x_2 =−(−8)=8  ((x_1 +x_2 )/2)=4  y=1−x  y_1 =1−x_1   y_2 =1−x_2   y_1 +y_2 =2−(x_1 +x_2 )=2−8=−6  ((y_1 +y_2 )/2)=−3  so the midpoints of chords (4,−3)

$$\left.\mathrm{2}\right){solve}\:{x}+{y}−\mathrm{1}=\mathrm{0} \\ $$$${y}^{\mathrm{2}} =\mathrm{6}{x} \\ $$$$\left(\mathrm{1}−{x}\right)^{\mathrm{2}} =\mathrm{6}{x} \\ $$$$\mathrm{1}−\mathrm{2}{x}+{x}^{\mathrm{2}} −\mathrm{6}{x}=\mathrm{0} \\ $$$${x}^{\mathrm{2}} −\mathrm{8}{x}+\mathrm{1}=\mathrm{0} \\ $$$${x}_{\mathrm{1}} +{x}_{\mathrm{2}} =−\left(−\mathrm{8}\right)=\mathrm{8} \\ $$$$\frac{{x}_{\mathrm{1}} +{x}_{\mathrm{2}} }{\mathrm{2}}=\mathrm{4} \\ $$$${y}=\mathrm{1}−{x} \\ $$$${y}_{\mathrm{1}} =\mathrm{1}−{x}_{\mathrm{1}} \\ $$$${y}_{\mathrm{2}} =\mathrm{1}−{x}_{\mathrm{2}} \\ $$$${y}_{\mathrm{1}} +{y}_{\mathrm{2}} =\mathrm{2}−\left({x}_{\mathrm{1}} +{x}_{\mathrm{2}} \right)=\mathrm{2}−\mathrm{8}=−\mathrm{6} \\ $$$$\frac{{y}_{\mathrm{1}} +{y}_{\mathrm{2}} }{\mathrm{2}}=−\mathrm{3} \\ $$$${so}\:{the}\:{midpoints}\:{of}\:{chords}\:\left(\mathrm{4},−\mathrm{3}\right) \\ $$

Terms of Service

Privacy Policy

Contact: info@tinkutara.com