Question

N(n+1)+2n+1
expand and simplicity

Answer 1

n² + 3n +1

Explanation:

n(n+1) + 2n + 1

i) distribute n into the parantheses

= (n×n) + (n×1) + 2n + 1

= n² + n + 2n + 1

ii) collect like terms

= n² + 3n +1