Answer:
[tex]k^4+10k^2+21[/tex]
Step-by-step explanation:
[tex]k^2 (k^2)[/tex] is the same as saying [tex](k)(k)(k)(k)[/tex] and so it'll be [tex]k^4[/tex]. Combine [tex]7k^{2}[/tex] and [tex]3k^{2}[/tex] by adding them both to get [tex]10k^{2}[/tex]. Then multiply 7 by 3 to get 21. Therefore the area of the entire rectangle written in standard form as a polynomial is [tex]k^4+10k^2+21[/tex]. Write the polynomial with the highest degree being first to the lowest degree and that's how you write the polynomial properly.
