[tex]\sqrt{7} x (\sqrt{x} -7\sqrt{7})[/tex][tex]=x\sqrt{7x} -49x[/tex]
Step-by-step explanation:
[tex]\sqrt{7} x (\sqrt{x} -7\sqrt{7})[/tex]
[tex]= x\sqrt{7} \sqrt{x} -7x\sqrt{7}\sqrt{7} }[/tex]
[tex]=x\sqrt{7x} -49x[/tex] [ [tex]\sqrt{7} \sqrt{7} =\sqrt{7\times 7} =7[/tex] and [tex]\sqrt{7} \sqrt{x} =\sqrt{7x}[/tex]
