Answer: B
Explanation:
Answer:
[tex]area \: of \: a \: square = {side}^{2} \\ = {( - 3x + 7)}^{2} \\ = {( - 3x)}^{2} + 2 \times - 3x \times 7 + {7}^{2} \\ = 9 {x}^{2} - 42x + 49 \\ thank \: you[/tex]
