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[shkspeare]

hi can some1 answer this for me

"The rectangle PQRS has two vertices on the X axis and two on the curve y=e^-x². Find (a) the value of x for which the rectangle has a maximum area and (b) the maximum area of the rectangle"

the diagram is below

thx! =]

 

[Affinity]

Hmm just a diffferentiation question

the area will equal 2 * x * e^(-x^2)

the answer should be x = (1/sqrt(2)) and area = sqrt(2/e)

 

[kpq_sniper017]

was that from fitzpatrick??
i think i've done it before.