MOHAMED IBRAHIM's answer to Megan's Secondary 4 A Maths question.

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MOHAMED IBRAHIM
Mohamed Ibrahim's answer
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First find the total area under curve using definite integral using limits x=0 to x=6. Since y=2x is below the curve, we subtract 2x from x(6-x) and the result we integrate using definite integral with limits 0 to 4 for finding the Area A.