Q203 · Practice questionTechnology-freeComplex familiar5 marks
QUESTION 203 (5 marks)
A curved bookmark occupies the region below and above the x-axis for .
a)[2 marks]
Determine the exact area.
b)[3 marks]
A vertical line x=c divides the area in half. Determine c exactly.
WORKED SOLUTION
5 marksPractice marking scheme
ANSWER
(a) . (b) .
Worked solution
(a) Use and . An antiderivative is . Evaluation from 0 to 2 gives .
(b) Set . Thus and . Select the positive root in (0,2). The integrand is positive there, making the divider unique.
Equivalent mathematically justified methods accepted.
Exact answers unless a decimal accuracy is specified.
Part a: Use substitution to integrate.
Part a: Evaluate both endpoints.
Part b: Set the partial area to half the total.
Part b: Solve for c squared.
Part b: Select the valid exact root.
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