Write the sum using summation notation, assuming the suggested pattern continues. -1 + 2 + 5 + 8 + + 44

345

Step-by-step explanation:

We know that

Given pattern :

-1 + 2 + 5 + 8 + ... + 44 = \sum_{i=0}^{15} 3x-1

We can write

Here,

On putting n = 15 in

So,

Also,

Therefore,

1^3 + 2^3 + 3^3 +4^3 = (1+2+3+4)^2

step-by-step explanation:

i am only able to answer the first part. i am not sure about the second part. sorry