17. Prove by induction that 1³+23++n³= (1+2+...+n)² for all positive integers n, that is, the sum of the cubes of the first n integers is equal to the square of the sum of the first n integers.

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17. Prove by induction that
1³ +23+ + n³ = (1+2+...+n)²
for all positive integers n, that is, the sum of the cubes of the first n
integers is equal to the square of the sum of the first n integers.
Transcribed Image Text:17. Prove by induction that 1³ +23+ + n³ = (1+2+...+n)² for all positive integers n, that is, the sum of the cubes of the first n integers is equal to the square of the sum of the first n integers.
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I don't understand how (1+2+.....+k)^2=(k(k+1)/2))^2. Please explain. Thank you 

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