Question

07 Evaluate the following expressions.
(a) 1³+ 2³+ 3³+ 4³+ 5³​

Answer 1

Answer:

225

Step-by-step explanation:

n = 5

Sum of cubes = [n(n+1)/2]^2

= [ 5 (5+1) / 2 ] ^2

=[ 5×6/2]^2

= [ 30 /2] ^2

= [15] ^2

= 225

Answer 2

Answer :-

225

Steps by Step Explanation  :-

1³+ 2³+ 3³+ 4³+ 5³​

⇒ 1 + 2³+ 3³+ 4³+ 5³​

⇒ 1 + 8+ 3³+ 4³+ 5³​

⇒ 1 + 8+ 27+ 4³+ 5³​

⇒ 1 + 8+ 27+ 64+ 5³​

⇒ 1 + 8 + 27 + 64 + 125

∴ 225