Question

How 4-2 root2 = 2 root2 (root2-1)

Answer 1

Step-by-step explanation:

RHS=

$2 \sqrt{2} ( \sqrt{2} - 1) \\ = > 2 \sqrt{2} \times \sqrt{2} - 2 \sqrt{2} \times 1 \\ = > 2 \times 2 - 2 \sqrt{2} \\ = > 4 - 2 \sqrt{2}$

=LHS

Answer 2

4-2√2=2√2(√2_1)

4-2√2=2×2-2√2

4=4