Question

Expand the brackets and simplify the surd
2√7(7-√7)
Please help

Answer 1

$\displaystyle 2\sqrt{7} (7-\sqrt{7} )=2\sqrt{7} \cdot 7 -\sqrt{7} \cdot 2\sqrt{7} = \boxed{14\sqrt{7} -14 }$

Answer 2

Answer:

14(√7 - 1).

Step-by-step explanation:

2√7(7 -√7)

=  14√7 - 14

=  14(√7 - 1).