Diagram shows part of the curve y=27-x^2. PQRS is a rectangle. Length of OQ is t units.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Diagram shows part of the curve y=27-x^2. PQRS is a rectangle. Length of OQ is t units.
Question 1
y = 27-x²
R
I units
The diagram shows part of the curve y = 27 – x. The points P and S lie on this curve. The points Q
and R lie on the x-axis and PORS is a rectangle. The length of OQ is t units.
(i) Find the length of PQ in terms of t and hence show that the area, A square units, of PQRS is given
by
A = 54t – 2t ³.
(ii) Given thatt can vary, find the value of t for which A has a stationary value.
(iii) Find this stationary value of A and determine its nature.
Transcribed Image Text:Question 1 y = 27-x² R I units The diagram shows part of the curve y = 27 – x. The points P and S lie on this curve. The points Q and R lie on the x-axis and PORS is a rectangle. The length of OQ is t units. (i) Find the length of PQ in terms of t and hence show that the area, A square units, of PQRS is given by A = 54t – 2t ³. (ii) Given thatt can vary, find the value of t for which A has a stationary value. (iii) Find this stationary value of A and determine its nature.
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