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Question
secondary 4 | A Maths
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Date Posted: 4 years ago
Views: 286
A = 18x - 2x²
dA/dx = 18 - 4x
set dA/dx = 0 ;
18 - 4x = 0
x = 4.5
max. A = 81-40.5 = 40.5 cm²
.
dA/dx = 18 - 4x
set dA/dx = 0 ;
18 - 4x = 0
x = 4.5
max. A = 81-40.5 = 40.5 cm²
.
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1. Find y in terms of x. Area of PQRS = 2x * y.
2. Find max x value by differentiation of A over x. Sub value of x into area formula to get max. area.
2. Find max x value by differentiation of A over x. Sub value of x into area formula to get max. area.
Date Posted:
4 years ago
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