I want check my answer

  • Thread starter r-soy
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3 – If r = -1 and frist term is 1/2 find the sum of the 10 terms of a Gp

4 - Use mathematical induction to prove that 2 + 4 + 6 ……..+ 2n = n(n+1)

5 – Expand ( 2x – 3y)^4 by using binomial formula

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D. Mark i can't type my work into the text entry box. i put it in attachment i'm very sorry
 

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  • #2
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3. S10 isn't 1/11. a1 = ? r = ? n = ? Substitute these values into your formula.
4. That's not how you do a proof by induction.
Show that the statement is true for some base case such as n = 1. (What does the formula look like if n = 1? Is it true for that case?)
Assume that the statement is true for n = k. (What does the formula look like for that case?)
Use your assumption in the previous step to show that the statement is true for n = k + 1.

5. You're sort of on the right track here, but you mixed up 2x by using 3x.
 

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