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secondary 4 | E Maths
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I don't know if there's anything missing or wrong with this question ... many thanks for anyone who can guide me to the given answer of B) 800
Thank you !!!
Date Posted: 2 years ago
Views: 338
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Date Posted:
2 years ago
Thank you so much for your solution, Jeremy ! Really appreciate your time and help. :)
Just wondering if there's any way to solve this without using calculus ?
Just wondering if there's any way to solve this without using calculus ?
I have given my reply in the second answer. See if you can understand. The key is to know that there is a 'double root equation' -(m-10t)^2.
Double root equation does not cross the x axis (parameter t in this case) graphically. This means if we solely plot -(m-10t)^2..without the k, the top of the curve (or the maximum) touches P=0 at t=3. We make use of this fact (P=0 at t=3, for p=-(m-10t)^2 without the k) to find m.
From m, you can find k.
Double root equation does not cross the x axis (parameter t in this case) graphically. This means if we solely plot -(m-10t)^2..without the k, the top of the curve (or the maximum) touches P=0 at t=3. We make use of this fact (P=0 at t=3, for p=-(m-10t)^2 without the k) to find m.
From m, you can find k.
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You need to recognise that there is a double root equation
Date Posted:
2 years ago
Yes, thank you so much, Jeremy.
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