Answer:
[tex]{ \tt{( \sqrt{7} x - 3 + 4) {}^{2} }} \\ { \tt{ = ( \sqrt{7}x + 1) {}^{2} }}[/tex]
» Split the bracket:
[tex]{ \tt{ = ( \sqrt{7} x + 1)( \sqrt{7}x + 1) }}[/tex]
» Open brackets following distributive property;
[tex]{ \tt{ = {7x}^{2} + 2 \sqrt{7} x + 1}}[/tex]
