A curve has gradient and passes through the origin. At what positive value of does it cross the -axis?
Answer and explanation
Correct answer: E.
- Step 1: Integrate: , and passing through gives .
- Step 2: Then , which is zero at and . The positive crossing is .
Answer
.
Why not the others: At the curve gives ; at it gives ; at it gives ; at it gives ; only gives .
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