ANSWER
Step 1
EXPLANATION
The given polynomials are:
[tex]( {k}^{2} + 2k - 13) - ( - 3 { k}^{2} + 9k + 1)[/tex]
Annie's expansion should have been,
[tex]{k}^{2} + 2k - 13+ 3 { k}^{2} - 9k - 1[/tex]
But she got:
[tex]{k}^{2} + 2k - 13 + 3 { k}^{2} + 9k + 1[/tex]
Therefore Annie made an error in the first step.
