Tan Y J's answer to Dylan Lim's Junior College 1 H2 Maths Singapore question.
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I messed up this qns(part III) before in my actual a levels by reading n term as sum of terms. So do be careful.
Date Posted:
4 years ago
Oh wait. My explanation for part ii is wrong. The sum is actually 0 due to the numerator. Hence not equal to 156
Thanks for the help! May I ask if guess and check is the only way to solve the inequality? Is there an algebraic method?
I use Graphic calculator
Yes, so I assume we can't solve it algebraically?
Yeah can't, conventional algebra like use of quadratic eqn can solve up to the power of 2. For higher powers, you need to use GC
Sorry, I didn't mean part ii. I meant part iii. For the inequality with both the indices and polynomial. Is there any way to solve for n algebraically?
Not that I know of.
For part ii, the correct explanation is when r=1, 3(1-1^n)/1-1=0/0, which is undefined.
Not =0, not =infinity. Something to learn.
For part ii, the correct explanation is when r=1, 3(1-1^n)/1-1=0/0, which is undefined.
Not =0, not =infinity. Something to learn.
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