Question

@Mertsj
-2√2 (5 - 5√5) + √2??
expand and simplify?~

Answer 1

-2sqrt(2)(5-sqrt(5))+sqrt(2)

Multiply -1 by each term inside the parentheses.
-2(5-5)sqrt(2)+sqrt(2)

Subtract 5 from 5 to get 0.
-2(0)sqrt(2)+sqrt(2)

Multiply -2 by each term inside the parentheses.
0sqrt(2)+sqrt(2)

Any term with a coefficient of 0 is 0.
0+sqrt(2)

Remove the 0 from the polynomial; adding or subtracting 0 does not change the value of the expression.
sqrt(2)

Answer 2

but then whats the answer?