Question

( 1+root 8 ) ( 1-2 root 2 )​

Answer 1

$(1 + \sqrt{8} )(1 - 2 \sqrt{2} ) \\ (1 + \sqrt{8} )(1 - \sqrt{8} ) \\ {1}^{2} - {( \sqrt{8} )}^{2} \\ 1 - 8 \\ - 7$

Answer 2

Step-by-step explanation:

(1+√8)(1-2√2)

=(1+ √4×2)(1-2√2)

=(1+2√2)(1-2√2)

=3√2×(-1√2)

=-3×2

=-6